I want to comment on a question and provide some feedback but I can’t.
How can I build up privilege quickly so I can comment?
You acquire privileges by building up your reputation. These concepts are discussed in the Help Center: What is reputation? How do I earn (and lose) it? and List of privileges you can earn. The short version is: there are basically three ways to get reputation:
I still find really strange that (apparently) newbies are allowed to edit others users posts but not allowed to add comments (to ask for more detailed explanation on a solution for instance)