Effects of Exporting a video as 30 fps or 60 fps

so I came across something while editing a bunch of videos, sometimes while editing the video section in the export tab Capture it changes to 60 frames/sec. I believe this is because my recorder outputs 60 fps videos, I have a question though what are the effects of exporting a video as 30 fps and a video as 60 if:
1 the video originally was 60 fps
2 the video originally was 30 fps
3 you don’t know the fps of the video
stuff like how it will affect the quality the size the time it takes to export and amount of pressure it puts on your pc.
also another question how will a video as 1280 x 720 instead of 1920 1080 exporting effect my video I already know it changes the size of the file but will it affect the quality or give it a black outline on sites like youtube. Happy New Year :pray: and thanks for taking the time out of your day to read this “heap” of text XD

30 fps video exported to 60 will just double frames double file size
60 fps video exported to 30 will cuts frames in half per second less file size
in windows click properties the details on the video file to see fps
in shotcut go to properties
youtube no longer letterboxes a video
all video ratios display on youtube without blackbars unless you purposely put them there.

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