Paint 3D works well for me to simply clean up screenshots and arrange it the way I want. I downloaded two of the programs mentioned above and I realized right away - it’s not for me, since I’m not creating photos.
I’m a big believer in using what works. If you don’t need the more extensive capabilities of the other programs (which come with a learning curve for sure), then don’t bother. The first time I used Krita I found it confusing, but the same thing happened with Photoshop many, many years ago. But I use a lot of the features in those programs so it was worth it to me as a professional photographer. Just use what works for you.
At the end of the day, decision is yours, stick to what you need, not what you want 
For basic uses, nothing is better then a basic software. And vice versa.
I believe pixlr is fairly easy with the basic version, almost at the same level with paint3d.
The first time I started walking, it was hard for me, I couldn’t walk properly, I often fell, I had to crawl many times. And to top all of that, I was 1 year old, and before that, I wasn’t even able to stand properly 
. But my determination to learn finally gave me the ability to walk 
(Just a better version of what @Tyrannocaster said)
@LTD I mean to say, everything is hard and confusing at first, obviously having the determination to learn makes you better at it.
Agreed. I definitely have been exposed to good information in this thread.