Lots of good advice here. the books section is useful on SQL Server Central. Accidental DBA[/url] is a good book to look into. There are a lot of training sites. BrentOzar.com has a 29$ course listing out a lot of the free training.[/url] I have a list here too. There are a ton of resources to work with.

#1 backups

#2 look for old documentation

#3 don't change things on a whim

#4 study, look, ask, learn.