which app is best for mobile video editing?

I don't know much about video editing. Also, I don't work in this sector. Lately, short videos are much in demand. So make short videos for different social media. Like converting images to videos and many more. I want to know from those who work with video editing Which app will be good for you? Besides, I want to work with the video editing in the future. What software should be known and learned in this case?