SSB World now has nearly 15,000 Smash 4 sets archived on it. You should use it to study Smash 4 players, characters and matchups.
Here are some key pages & site sections:
- Panda Global Rankings
- Smash 4 Character Usage
- All Smash 4 Characters
- SSB World Homepage
- Smash 4 Player Database
- Top Smash 4 Characters
- Matchup Sitemap
If you are serious about getting better at Smash, this is an invaluable resource.