How can I reduce JPEG file size in KB on Windows 11 without losing quality?

I have hundreds of  JPEG images on my Windows 11 PC that I need to make smaller in file size (KB). The images are currently too large to upload to a website and email, and I plan to reduce their size while still keeping them clear enough to view.

Honestly, I'm not very experienced with image editing, so I'm looking for a simple and safe method to decrease the size of jpeg file below 100kb if possible.  Not sure if Windows 11 has a built-in tool for compressing JPEG files, or if I should use Paint, Photos app, or a third-party program.

What is the easiest way to reduce jpeg file size in kb on Windows 11? Is resizing the image, changing quality settings, or using compression software the best approach?