I recently came across a situation where I had many images in a single folder which all needed to be converted to the .png format. This folder contained images in various formats such as .webp, .jpg, and .jpeg.
Instead of running FFmpeg on each one individually or creating commands for each file individually, the following command automatically ran FFmpeg on each of the files in a loop:
for %f in (*.*) do ffmpeg -i %f %~nf.png
This is a modified version of a command found in a blog post on OTTVerse which covered a similar use case.
I'm still a firm believer that, no matter your level of tech savvy-ness, you should learn how to use FFmpeg, even for simple file conversions. It's a very powerful tool and can save tons of time, be it converting from .jpg to .png, extracting audio from a video file, or compressing a media file for upload somewhere else.