The tip I most often wish I had received and followed when I first began doing genealogy is to ALWAYS cite sources. I can go back and recreate source citation but it is a real pain.
As a beginner I was doing genealogy mostly as a hobby and curiosity. I knew where I had found my information. I knew which census images I relied on. I knew where my parents and grandparents married. Now I am trying to take a more professional approach. It's time to go back and add all those sources. It would have definitely been easier if I had cited sources in the beginning. Searching is much more fun than writing up sources!
One of my goals this year is to go back and cite sources and enter them into my computer program. In fact yesterday, I entered source citation into 3 different genealogy programs to see which program had to best source citation framework for my use. After I have decided which template I like best, I will enter all my sources that way and then import the file into the other programs.