Hi, is there a difference between Hold and Hold Forward when sequencing strips?
Also, what is the benefit of hitting Tab in the NLA Editor to enter Tweak Mode when I still have to edit the keyframes in the Action Editor
Hold will hold the strip before and after (you can think of it like repeating the first and last keyframes forever in either direction), while Hold Forward will only hold the strip after it's complete. It's also visually indicated by a transparent color to the sides of the strips:
Entering tweak mode in the NLA editor will make the Action Editor jump to editing that particular action, so it's just a faster way of jumping between editing different actions.