Someone tweeted a link to this very nice Org table tutorial from 2013. Even though it’s fairly old, the information is still up to date and useful. I learned a couple of tricks that I either didn’t know or had forgotten. One such trick is how to add a line under the current row. I always struggle with that and end up doing it in a less than optimal fashion. It turns out to be simple: just type Ctrl+c -.
There are other shortcuts that you may not know about so it’s definitely worth a look. It can also serve as a cheat sheet so you might want to bookmark it if you do such things.