What if you lived in a shed? There are many companies such as Tuff Shed/Home Depot that sell portable sheds. These are usually marketed as being for storage/utility purposes, but some of them can be quite sizable with fairly nice finish, windows, porch, etc. It's hard to find a direct link since these are often made to order, but I've seen examples that are subdivided into rooms like a normal 2 bedroom house (including bathroom and kitchen area) and have comparable square footage for about $20k. Since this is much cheaper than a typical house, is there a legal or regulatory reason why you can't just buy empty land, put one of these sheds on it, and live there and use it as your primary home address?
In the US, the laws that govern habitable residences and the related issues - such as land zoning, health regulations, sewer and water services, private and commercial building codes, etc. - are very localized at the city and county levels. So you need to check with the city and county where you want to place such a structure and determine the relevant laws. Commercial buildings are much more heavily regulated than private residences. (And some federal laws and codes could supersede local laws.) Many cities and counties have their zoning and building codes and requirements online, as well as permitting systems to apply for building and utility hookup permits. It's true that some counties in the US have minimal zoning or building codes, so yes, you could move a shed to land you own in that county and build your own road, haul your water, put up solar panels, dig an outhouse, and not deal with any - or very few - regulations. But cities and towns will be much more regulated, since zoning and building codes are used to insure public safety, and services such as water and sewer are supported by taxes and protect public health. In other words, you may not legally be able to live in a shed that does not have city sewer, water and electric service. There may also be building codes for minimum size of bedrooms, egress windows for fire, ventilation, heating systems, so even if a small house is sold as a complete residence in a package, it may not pass local building codes. Breaking zoning, building and health codes can result in the local inspectors visiting and determining if the residence is up to code; they will not typically need a warrant or your permission to enter. They can order you to bring the residence up to code, if possible; or condemn the structure and require you to move out.
The information in telephone books is public. so are postal change-of-address records. So are records of the ownership of real estate. So are vital statistics such as birth records. So are voter registration lists -- i myself purchased a voter registration list (in digital form) for a municipality which showed people's names, addresses, and the years when they voted, when I was a political candidate for local office in NJ. It cost about $100. I believe that many states also make driver's license information available for a fee to marketers. Credit records are available for certain limited purposes, also. No doubt there are other public sources I haven't thought of. If such a site relies on public records, or other publicly available data, it is not illegal. Many such sites offer to remove names on an opt-out basis, but there is no legal requirement that sites do so. This kind of information is not considered nto be "private facts" under US tort law. Aside from opting out, if the sites provide that option, I don't think you have any recourse. One could ask the local legislature to pass a law prohibiting such sites, or making them require consent, similar to the GDPR that the EU has. But I don't know of any such law in the US to date.
Your landlord has an obligation to allow "quiet enjoyment" of the premises. Essentially this means that, unless they are damaging his or her property, the tenants are entited to act as though it were their own property. Many people take drugs at home. Between the tenants and the landlord this is not something the landlord is allowed to get involved in. If you believe there is criminal activity going on, you can but are not obliged to report it to the police.
Laws regarding billboards and advertising are very local in nature and are typically handled under city/county zoning ordinances. Start with calling your local county zoning office. They will tell you the city/county laws regarding your particular residential zoning overlay, if city or state laws supersede county laws, and recent changes in law that might matter and if the sign might be grandfathered. There can be different types of "residential" zoning and the city/county will tell you this; some allow limited commercial use and signage, and some don't. The housing subdivision you are in may also have covenants; you'll know if there are covenants if you received information when you bought property in that subdivision. 1,2,3,4,8: These depend on local laws. 5: Very generally speaking, land owners typically do not have absolute rights to land usage; that is the rationale behind zoning laws (among others, like health and public safety, building codes, national defense, etc.), because some types of land usage impact adjacent users and the general public. 6, 7: Potential consequences include fines and requirements to take the billboard down, but again, those possibilities are very localized. The size of the billboard could come into play; again, this will be very localized. Some signage may be grandfathered, too. In order for the city/county to look at the situation and possibly take action, you may have to file a written protest with the zoning office; they would help with the process. You may have to present your case at a public city council or county commission meeting, but that basically involves saying such and such is happening and you want the city/county attorney to look into relevant laws. It would help your case if you had a list of names of others in the area who are also unhappy about the billboard. I doubt you will need legal representation to lodge a protest, but if it comes to that, Google for free legal aid in your area. If the city/county attorney won't take action (which is possible, as this involves prosecutorial discretion as to if the city/county wants to press the issue with the landowner), you can look for free legal aid in your area and consider your options.
Not a lawyer, but: In many countries, a purchased item is your property once you removed it from the premises of the seller. In practice, this rarely makes a difference. You have entered a contract with the seller where the seller has to deliver the product, and you have to pay the money, you did your part, they have to do their part. There would be a difference if the item was stolen while in the store, or damaged by fire, or if the store went bankrupt and bailiffs took the item. If these rules apply in your country, then what they did is not theft, otherwise it would be theft (in all countries, if the store removed the door from your home after it is installed, that would be theft). You paid for a door, the store owes you a door. You have a legal contract. Both sides are bound by that legal contract. They have to do what the contract says (delivering the door that was displayed in the store), if they can't, then they have to do the nearest thing that isn't to your disadvantage, like delivering a new door. Or possible a different door that was on display. They can't just declare your contract invalid because it suits them better. That wouldn't be the case if this would put the store at an unacceptable disadvantage. For example, if thieves had broken into the store and stolen ten doors, including yours, the store might get away with returning your money. Since they intentionally sold your door again to someone else, I don't think they could use this as an excuse. I'd go once more to the store and ask them whether they want to deliver a door to you, according to your contract with the store, or if they want you to get a lawyer. A letter from a lawyer might work wonders. (Or of course the lawyer might tell you that I'm completely wrong, but they don't know that, so telling them that you will hire a lawyer might be enough).
No crime is committed if a person performs a service and ineptly describes the service. To change the context a bit, I might contract with a guy to build a wall and he says he will charge me for installing a "Swedish drain" when in fact what he will install is called a "French drain". If he installs the thing, it does not matter (legally) whether he calls it by the conventional name. I am not relying on the distinction between French and "Swedish" drains, and that is not material. However: he may specify that the drain will use 18 inches of 1.5" drain rock, but he uses (and intends to use) 18 mm of 3/8" crushed rock, and that is a material fact. In the latter case, he has committed fraud. The same considerations go into dealing with "unnecessary" service, which however is more about "what he said". Let's assume that you come in with a flat tire and the mechanic offers to overhaul the engine. If you agree to this service, that is not fraud, because he did not say something false that you depended on. If, however, you ask "Why would overhauling the engine be necessary" and he says, I dunno, "Because by law, I can't repair a tire without first overhauling the engine", or "Because you flat was caused by astral radiation from a poorly-tuned engine", then that would be fraud – the statements are false, and you relied to their truth, in agreeing to the service. On the third hand, reasonable statements like "it might help", "it could work" are not deceptive, even if it turns out they are not true. Fraud is not about statements that "turn out not to be supported by the facts", it is about statements that you know to be false.
It may not be legal -- in many places zoning restricts running a business from a residential address. If the academy involves physical students, the landlord could reasonably claim an increase in wear and tear, and liability risks. In any case, with a month-to-month tenancy, the landlord can normally raise the rent with a month's notice for any reason or none.
You should have seen this coming. This might vary a bit from place to place, however it would generally be accepted that if you are in a rented place, you have to pay rent. Most jurisdictions would have some law which requires pro-rata'd payment for the time you actually stay, there would not be any requiring the landlord let you stay free. An uninvested third party might ask "Why would a landlord provide you with 5 days free rent". Another way to look at it is that one of the elements of a contract is consideration (think payment) - Thus in contracting to stay in his place longer you should expect to provide consideration - and pro-rata'd rent would be typical.