When the balloon starts to descend, it often will only start moving down, rather than changing directions.  It’s also possible to change direction by tilting the balloon or adjusting the heat, but you probably shouldn’t mess with those unless you’re an experienced pilot.
assitant
It seems like you could steer the balloon in all directions by manipulating the airflow around the heater.
assistant
How do hot air balloons work and is it safe to ride in one?
user
I don’t have good answers about hot air balloons, but this article on CNN says there have been approximately 24000 balloon-related deaths worldwide, including 970 in the US alone.  If you read the article you’ll see that it’s quite common for pilots to ignore all the warnings about doing things like flying in fog or bad weather, and people often don’t wear a harness which the article says increases the risk of falling out of the balloon.  It’s especially dangerous if you haven’t practiced in the balloon before you fly.  There’s also a discussion about when it’s safe to go for a ride in a hot air balloon, if you’re really determined to try it.  I think the risks are too high to be worth the reward.
assistant
How does a hot air balloon ascend and descend?
user
When a hot air balloon rises, the air in the balloon gets hotter as the heater heats it up.  And as it gets hotter, it expands, and this makes the balloon rise.  When a hot air balloon starts to descend, it doesn’t actually get cooler, but the air pressure in the atmosphere gets lower, so that is what makes the balloon descend.  The air pressure in the atmosphere is actually different everywhere, and the surrounding air pressure on the balloon determines whether the balloon goes up or down.
assistant
Can you steer a hot air balloon left and right or does it only go up and down?
user