WordPress Support

Hello WP community!
It has been days that I’m struggling to upload a simple style sheet for twenty eleven child theme, yet up to now I’m still clueless as to where I have gone wrong. I copy-pasted the code from WP Codex, I made no modifications except inserting my name as author. I tried uploading it as a zipped doc using my admin’s dashboard install option. I also tried uploading the style sheet through my host’s CPanel via File Manager, both of which to no avail.
Yes, it is simpler to just download a zipped file from the web and install, no hassles, but I also would want to learn the most basic principles of programming, afterall its me who manages my site.
I tried twice to contact my hosting provider but got no help other than to be told to contact WP application blah blah.
What baffles me greatly was that I managed to upload a copied sytle sheet earlier.
Well, if this is the case, then it is really sad for us beginners who are ignorant about coding and also expensive because then everytime we will be hiring someone to do the tweaking for our sites.
I welcome every comment.