Ask, Answer and Comment
You can ask and answer questions, comment and vote for the questions of others and their answers. Both questions and answers can be revised and improved. Questions can be tagged with the relevant keywords to simplify future access and organize the accumulated material.
Or Just Browse
You can choose to just browse the questions that have been asked and answered. Just pick the tag you are interested in and you will get all the questions and answers related to it.
Vote, Like and Accept
Vote up or down the questions and answers. Mark what you like as favorites. And if your question has been satisfactorily answered, accept that answer to question.
Get various badges depending on how others vote your questions and answers. See badge details here