I am too dumb to use Davinci Resolve

Hello,

I am using the GoPro I got for Christmas to record videos of us playing pickleball matches (similar to tennis).

All I'm doing is mounting the GoPro to a fence then recording. When I view the SD card, they come back in 5 minute clips which is fine. I'm trying to cut/combine these clips by each match which should be about 10-15 minutes long.

I am having the most difficult time using DaVinci Resolve to the point where I think I need to get tested for some sort of mental disability. I had success with the Windows 10 preinstalled Video Editor/Photo app, but when trying to add multiple videos to the "story board" it often crashes which is why I looked into other solutions.

Is there another recommended free software to use to literally just combine/cut clips? I do not need to edit in any other way. I want to take this 1.5 hour pickleball session that GoPro is breaking into 5 minute clips, into 10-15 minute clips broken down by match.

Yes, I am very frustrated and very dumb.

Edit: Thank you all for your suggestions. I will try out handbrake and give resolve another go this weekend. Honestly just had a tough work week and was venting but hopefully this information will be helpful to someone else as well.