I’m assuming you have a monthly subscription to the videos. EDIT: I watched 5 minutes of it and the video I recommended is too outdated, and not as useful as I remember it being. I’ll look for a different suggestion and get back to ya. 

If you want a more cookie-cutter approach to picking ranges, you can get some good RFI charts free from upswing poker, but they are designed for 100bb play, so you’ll need to know how to adapt them as stacks get shorter. Regardless, it will give you an idea of which hands are strong from each position. A general rule of thumb is to favor hands that make more strong pairs, and raise with less hands that get most of their value from making straights and flushes. For example, at 100bb I think A5s is a much better hand to open UTG than KQo, at 25bb I would argue that the opposite is true.