Common frame rates include:
Remember to set the frame rate of your project at the beginning. Any clips that do not conform to the timeline frame rate will be played back with skipped or duplicated frames to try to match the timeline frame rate.
It’s tough to convert from 30 fps to 24 fps so do try to avoid this. Most of the other common conversions are possible with less potential for harming the image.
This is the process of converting 24 fps footage to 29.97 fps. The opposite is called a ‘reverse pulldown’.
The increased “temporal” resolution of 60i makes for a better conversion to 24p.
Drop Frame Timecode drops two frame numbers from each minute except every tenth minute. This isn’t dropping actual video frames, just the timecode numbers relating to those frames. Notice the ; semicolon used to designate drop frame timecode.
Drop frame time code does NOT exist for 23.976 because there simply isn’t an easy way to make it work mathematically.
Frame.io has a great resource on timecode and frame rate.