Hi Bekki. One good place to start may be to watch this video where the guy that created the LOD concept speaks about them. Let me know if this helps. Also, there's lots of material available when googling or looking in the general forum.
I've coached quite a few consultants and trainers from newbies to Tableau pro. If you are still stuck on anything, my email is Tiff@21foxtrot.com. Happy to help, hop on a call, walk through some scenarios, etc.
Bekki McCormick There are some great training videos on Udemy. There is a beginners course led by Kirill Eremenko called "Tableau 10: A-Z Hands On Tableau Training" that was amazing. I used it when I was first introduced to Tableau for work and I was up and running in a few days.
Hi Bekki -
For new Tableau users who are most familiar with Excel - I always recommend this session from our conference; Sign Up | Tableau Conference Live
All you have to do is register with your email and you can watch the video. It's really good!