Saving electricity

I went back to work yesterday, and had a meeting following work, so I didn't get a chance to come back at all yesterday. It was a long day. I'm also in a rush this morning as I have a lot of things to do before I go back to work, and I overslept an hour. So I'm going to rely of you all to add to the comments here which will be part of the post on how to save electricity. I'd like to know how