I don't know anything, but I like photography. I really want to make my own films and photos into videos and keep them in the computer forever. ...

Find a video production software. Basically you can make it faster and slower. Drag and drop photos and movies to the time bar, then drag and drop music to the time bar, and then choose a transition animation. Basically, most video production software operates in this way, and many of them are in Chinese, which should be easy to understand. I lost my old computer (thief who killed thousands of knives) and forgot the name of the software I used before, otherwise I can recommend it to you.