Check the General Advancement Table and find the level you are advancing to on the left side. Go across and see what kind of skill or benefit you get at that level.
Check the Path Advancement Table on your character's Path specific page. If you are advancing to a level on that table, you get that benefit in addition to what is on the General Advancement Table.
The above only changes if you are a Dual-Path character since your Character and Path Levels might be different. If you are not a Dual-Path character, Character and Path Levels are the same.