What type of weather do they like?
Cold weather like winter and six months of hot weather.
How much sun light do they need?
Full sun light in almost all cases. Only a select few are shade varieties.
How often do they need water?
If it is tap water it can be modified with white vinegar, and that will keep the cactus seeding healthy.
Where is the best place to grow a cactus?
The best place to grow a cactus is in a group of cactuses