NOBODY. Should ever trade a single stock until they know every single thing about "Wash-Sale Rules". This could end up ruining your life by not knowing this. Imagine turning $1,000 into $1,000,000 and then in the same year losing $999,000 in Wash-Sale losses. This means that your account value is now $1k again but you have $1M in short-term gains tax to pay that year.
(roughly a $450k tax bill you owe with only $1k to your name.