Our first steps tour and our frequently asked questions will help you a lot after registration. They explain how to customize the interface (for example the language), how to upload files and our basic licensing policy (Wikimedia Commons only accepts free content).
You don't need technical skills in order to contribute here. Be bold when contributing and assume good faith when interacting with others. This is a wiki.
Please see this:
... which puts into a diagram what a lot of words could say.
You are still over-categorising! For example if you categorise something as 'in Manchester' there is no need to also categorise it as 'in the United Kingdom'. As a rule of thumb if an item or category belongs directly to more then 3 or 4 categories you are probably over categorising. You are regularly hitiing 7 or 8. S a g a C i t y (talk) 19:01, 9 May 2018 (UTC)