How do i put in video clips from videos into my game? I would really appreciate you if you could help me.

You'd need to turn the video into a GIF file, which is basically an animated picture. If you wanted audio you'd have to make that a separate file. Then when you are in scratch, there should be a button where you find the “new sprite” buttons that says something like “import sprite.” Then click that, select your GIF file, and bam, you have your video into scratch. Then do the same thing with the audio file, and make some scrip that looks like:

Only put in the wait block if the video doesn't line up with the audio.

You can't Import Video Files Directly, But you can do something Simalar using GIFs, So if you Convert the Video into a GIF file, then you can import it as a Sprite directly, Resolution is only 480x360, and you can't make a Movie (Really Long Animation) or else the Project File Size would be Huge

Or you can use pen, and sound cut into 1 second bits. Eg: https://scratch.mit.edu/projects/83967960/