What should I do exactly with dots? I just don't get it

Thank you for trying to help me. I will give you an example for better understanding me. For input "H !e,Wdloollr", 4 the output is "Hello, World!". But my answer is Hdr Wll!,oleo.

Do not really understand what decode function should do. I thought that logic is almost the same as in encode function but it is not and I am stuck. Can someone help me?

Thank you for your advise. It is my first time creating kata and some things I do not understand how to do and do not understand where to read about it. I know that kata itself is not ideal. I found this task on the internet and it was interesting for me how can this task be solved in other ways. That is why I decided to try to post it but could not even imagine how difficult it is

Thank you for your feedback. I really appreciate it.
I guess, I fixed everything in my new kata. If you try and something goes wrong, give me a feedback!
Thank you!

Now I got it, thank you very much!

Do not really understand a task. Can someone help me pls???

Do not really understand a straight condition. Can someone help me?

Yeah, thank you!

Literally have no idea how to fix this:
"func()
TypeError: likes() missing 1 required positional argument: 'names'"
Can someone help me please?