^^^ Good tips above. To say it in slightly different terms:
- Wide-angles distort perspective, the closer, the more distortion.
- Wide-angles exaggerate the relation between near and far, separating the two (compared to telephotos, which compress the near and far),
- Wide-angles give you phenomenal depth-of-field even with small apertures so you can get everything from your toes to the horizon in focus.
- your 10x10 closet of a room becomes long enough to hold a bowling alley.
However, with great power, comes great responsibility.
- Put people at the edges of the wide angle, and they gain 300 lbs.
- get close to people's faces, and the cute little button nose becomes a camel nose.
- your toes get to photobomb almost every shot.