Software or Program that I could copy and paste problems from SoloLearn challenges to understand where I went wrong?

Question

I am still finding it difficult to understand basic lines from challenges and I REALLY need some advice. I spend roughly 3 hours a day "studying" programming topics (Readings, Open Source Codes, SoloLearn) and I am finding myself frustrated due to my lack of understanding of what lines I am misinterpreting. If anybody in the community knows where I could maybe copy and paste previous challenge questions so I can have a line-by-line explanation of what the code is saying, PLEASE SHARE!! I BEG YOU!!

Answer 1

There are several online editors:

jsfiddle
goplayground
compilejava
etc...

I typically use these to test small pieces of code if it is inconvenient to run in IDE/terminal.

Answer 2

There's code playground here on sololearn you know.
Where you can copy paste challenges and test them.