Hi Oscar! I'll see if I can help with some of these questions.
Not sure if you're talking about the banners under the usernames here or perhaps the hashtags that people use. On the banners, here are a few that I'll explain that may be helpful to you.
1. "Team R2R" or "Staff Member" - all moderators have these banners under their name, so either of these means the member is also a moderator.
2. "Reef Squad" - these awesome folks are members who work tirelessly to help others around the forum. They have valuable knowledge and experience and freely offer that to answer questions posed by other members.
3 - "supporter" and "partner" members have contributed financially to the forum. R2R doesn't charge for membership, but members who want to contribute financially do receive some additional membership benefits (for example, supporter members are able to sell immediately and also have the ability to edit their posts indefinitely).
On the hashtags (words with the # symbol in front of them), here are some good ones to know. You can use these to request help from members with expertise on questions you may have:
1. #reefsquad - alerts the members of the Reef Squad to a thread where their assistance is desired. (Btw, I won't be using the # symbol one the rest of these in order to avoid calling all of our teams to the thread.

so from here on, I'll just list the word you would use after the # symbol.)
2. mods - calls the moderators' attention to the thread.
3. SPSexperts - calls on some of our members who have knowledge of SPS coral care
4. LPSexperts - same as the above, but for members who know LPS corals
5. ZOAexperts - same as the above for zoas and palys
6. DIYwizards - members who know a lot about DIY work.
I think the concept of "bumping" a thread was explained really well above, so I'll move on
Actually, you joined on April 25th, so you haven't been a member for a month yet (you can always check your join date by clicking on your username). Keep at it though! We love having new active members join us!
chances of winning a contest are generally directly tied to the number of entries in the contest. The cool thing is that at R2R, we ALWAYS have several contests going, and so we have LOTS of winners!

Some lucky people have even won multiple times!
Hope these answers help. Let us know if you have additional questions.