How to edit many animation clips into a video, and then match it with music? Need a detailed tutorial, the best, thank you.

Use Adobe Premiere, video editing software, open the software, create a new project, and find the size you want. Nothing is needed by default. File-Import-Import the cartoon you want to cut, drag it to the workspace below, drag the red pointer to the position you want to cut, find the razor tool in the lower right corner, cut it at the place you want to cut, and then separate it. You can cut the animation into many segments by the same operation, click on the unwanted segment and delete it. In addition, it should be noted that video and audio are integrated. If you don't want intermittent sound, just click the speaker next to the audio to turn off the sound. In the same way, import the complete sound and insert it. So that the next video can play the full sound. When finished, you can export it-movie or Adobe media encoder, select the type you want, save it, and then render it.