I used to use the whatever Microsoft Office's picture editor was named until I bought a laptop that has Windows 10. It looks like that does not exist anymore and the new picture editor does not let you resize pictures and save them.
What is a good program to do this?
I like Picasa for most non-batched photo operations. http://picasa.google.com
https://www.youtube.com/embed/QEzhxP-pdos
Seriously though if you ant to stick with a built in MS product, I know MS Paint does resize and crop on Win10
^^ That has got to be the funniest thing ever to come out of King of the Hill.
@Slippery: as much as I want to be snarky and write "Linux" 
, there is a very, very good free program for windows that does what you want & tons more things. Check out IrfanView.
JPEGs are already compressed. You can't really compress them any more without degrading the image (for example by increasing the JPEG compression level).
Your best bet for making a JPEG smaller would be to recompress it as a WebP. There would be a very slight loss in quality by it would be about 3/4 of the size it was as a JPEG. The WebP format isn't widely supported though.
Use GIMP 2. It's free. When you Export, save as JPG, click Show Size or Preview or whatever and move the slider around to the picture quality you are comfortable with, or the size you want to target. You can mash a JPG pretty hard and still get an image that is virtually identical to what you started with.
If you just want to resize photos then Paint.net is pretty simple and easy to use. Free too.
http://www.getpaint.net/download.html
Been using InfanView for a number of years. Been using a progems called PolyView for even longer.
Polyview is quicker for size manipulation but InfanView is a better photo editor.
I third infanview.
You'll need to log in to post.
