Hello, please share your file: https://pasteall.org/blend/
Here you go, I’m quite new to rigging started a week ago. Sorry for being 3 hrs late I had school.
if you select your armature, then shift select the mesh, then switch to Weight Paint mode, you can see what are the weights for first and second bones of the right arm, they are correct:
but for the left arm they are bad, bones influence parts of the mesh that they are not supposed to:
so you need to correct this with a brush in Blend > Mix and Subtact modes (in the N panel):
I did see weight painting and tried it but didn’t know what it does, thanks for the help.
Oh also don’t forget to recalculate the normals of your mesh. If you ever meet a difficulty please ask 
It’s not letting me select the bones.
Select the armature first, then shift select the mesh, then switch to Weight Paint mode
Every bone is blue which it shouldn’t be right? When I select another bone it has the same weight I just painted.
it should look like the screenshots I showed above
It doesn’t, the bones aren’t showing the actual weight. I can select the bones tho.
please show some screenshots or even a video, it’s hard to tell what you’re doing wrong
give me a second. My computer closed give me a minute or two
maybe you’ve enabled the Face Orientation option and forgotten to disable it?
I can’t upload it just send me the file or a video on how you did it.
here it is, I hope it helps:
How do you select the bones in the viewport?
Ctrl left click by default I think
