I don't see any serious problems with your questions, other than the fact that some are fairly "novice" questions (which isn't a bad thing, it's just a thing - Everyone starts somewhere).
You only seem to have one that has attracted (as of my writing this) a single downvote, and your reputation changes have been largely positive -- that's a pretty good track record.
I do have a few general suggestions though:
First, try not to take downvotes so personally.
Seriously man, you'll give yourself an ulcer. The standard boilerplate here is:
Users are free to upvote or downvote questions for whatever reasons they want - there are some guidelines when you hover over the arrows, but much like when you go to the polls on election day voting on Stack Exchange is an entirely individual choice. Mods and SE staff pretty much don't get involved.
Second, try to write your questions in a way that conforms to Standard Written English.
There is no hard and fast rule on this (aside from "It has to be in English"), and we're a lot more relaxed about it on Meta, but slang, venting, ranting, etc. are all looked upon as a Bad Thing. Questions should be distilled down to to "This is my problem, this is what I've tried to solve it, and this is what didn't work".
Finally, don't rant.
At least one of your questions that I looked at (the one with the downvote, incidentallythe one with the downvote, incidentally) is a little ranty, and things that look like rants tend to get reflex-downvoted.
In a related vein, it's generally considered bad form to tell the people reading your question what you want the answer to be (stuff like And please don't say compile from source, cuz CentOS hates that answer...
) -- Trust me when I say the people answering questions here know what the vendors prefer, and if we tell you to do something a certain way there's probably a good reason for it (you can always ask us why we recommend something if you think we're crazy).