Other users reward you with them when they feel you deserve them. This can be as simple as answering a question or posting a guide about something. You can get them for a lot of reasons but it's all about being helpful. *I'll try and find the board specifically about it. EDIT: announcements-rules-and-information-f73/how-the-reputation-system-works-t16891.html There is a board all about rep points. Hope I helped.
by helping other members if they ask for something. ie: helping with abing lists - helping with school projects or homework problems in that section - or helping them with getting a program or something on their computer to work. basically you just gotta help them in a USEFULL way.