I´m struggeling with GitHub.

I´m struggeling with GitHub. Problems:
A) After creating a repository - where can I just upload my files?
B) In this case https://github.com/StefanPetrick/FunkyClouds/blob/master/FunkyClouds the spacing got screwed, the comments got formatted (including the ascii “art” pics) and I have no syntax highlighting. How can I fix that?

Git and GitHub took me a while to get used to.

A) You should use Git to upload your files. Have you went through the steps here yet? https://help.github.com/articles/set-up-git/

B) Use whatever you’ve been using (Arduino, Atmel Studio, etc) to work on your code, and just use Git to push, pull, merge, etc. Here’s a help article on adding an existing project: https://help.github.com/articles/adding-an-existing-project-to-github-using-the-command-line/

The syntax highlighting is not there because there’s no file extension. Github uses the extension to know what kind of file it is. Rename it with the .ino extension it (presumably) originally had.

Are you using the desktop (Mac/Windows) app?

Not yet. I intended to just upload my code for now. Probably I should copy it all into one file and copy+paste it to Gist instead.

I think you would find the desktop app gets rid of all the hassles. It’s worth the 25Mb