Venus
There are two major problems with Venus.
①The atmosphere is almost composed of carbon dioxidide.
Venus contains a lot of carbon dioxidide, which is harmful to humans, and oxygen has a very thin atmosphere.
First of all, I don't think I can live without increasing oxygen in some way.
②There is no water
Humans usually die in a day or so without water. However, there is almost no water on Venus.
Moreover, the clouds that surround Venus are not made of water, but of dangerous sulfuric acid and sulfur dioxidide vapors.
It will be difficult to live on Venus without water.
Countermeasures
Regarding ① and ②, we thought that the best way to increase oxygen in the atmosphere without water is to grow plants that are okay without almost no water, that is, to grow "cacti". This solved the water and carbon dioxideproblems.