explain the ranking system and how I can get up here.and for how many will rise .

Your rank is calculated on the number of posts you make.
Jr. Member - 20 posts
Full Member -  60 posts
Sr. Member - 120 posts
Hero Member - 500 posts
Legend / Legendary - 1000+ posts

As an Airdrop Hunter, first, let me answer your questions briefly -

Is it building a real community? Yes
Are these people that already join hundreds of other projects really interested in the project? Generally NO. There are exceptions anyhow
Or they would dump it in the nearest opportunity? Yes, with few exceptions
a big number would even unfollow and leave channel after getting the tokens .... Yes

Do airdrops create real communities? or just ephemeral ones? It's short living but serves the purpose.

Let me answer in detail. Generally, airdrops are meant to build a healthy community so as to attract potential big investors during the private sale, preICO & ICO stages. If you are a big investor, will you invest in a project which has only 500 members in their social media community? Definitely NO, because the community backing is very less. However, if you have around 20K+ members then you might think about investing. Because 20k members are actually gonna use the tokens without the usage, the tokens are worth nothing. So the community built is real and of course ephemeral but it serves the purpose of attracting investments. I think once the money has come in, you actually don't need a big community to follow in social media. All you have to worry is about trading volume and real-time usage of the token.

Will we dump it in the nearest opportunity? Yeah, most probably we will look for a way to dump the coins once they get listed in an exchange because we actually don't care and we don't invest a penny into them. But if some news about some project catches our eyes, we might start following the project and may hold the token or even invest in them. Few examples in my experience are Kepler, UBEX and WAB.

Welcome to the community @DanielMidy. I took my fair time before investing in Cryptos, so i suggest you to take your own time before investing into Cryptos since the market is very volatile. Nobody can judge whether crypto market is ready for another bull run like the previous year. But if you invest,  make sure that you don't regret even if your investment went down to half or even below. Do your research and invest in solid platforms so that even if you lose in bearish market it will rise back to its glory with time.
In the meantime,  you can participate in Airdrops and Bounties for earning free Cryptos. Feel free to check my channel, I share few good airdrops that will be worth your time spent.

We all know that link shorteners are by default not allowed in the forum due to the blacklist. Today, I came across a spammer who used no link shortning website to shorten his referral links.
Ex: http://no link shortning/nau5wy

So, I think its time for the admin to put the website on the blacklist to avoid such spams.

-skip-

I will ask few questions about content reporting.

How much, how member should report to let know this is for karma removal?

For sure members will ask this questions.

I believe, the admin has already made a post about that here - https://www.altcoinstalks.com/index.php?topic=31311.0.
If the report made is correct, they'll gain +1 karma thereby neutralising the - Karma.

Hello administrative I wrote 2 days ago . relieve negative karma . Thanks

The admin has already replied to your concern as quoted below. From now on start reading before you make a new post.

to get rid of negative karma :
- contribute good content, or even some analysis
or - find content to report : spam, or wrong section
or - have 600 points , if you want to remove karma with points

I am new in this forum and i like to know if someone can help to know on how i can become a spartan member.

First, you'll have to apply for Jr.Spartan membership, which can be found here - https://www.altcoinstalks.com/index.php?action=profile;area=groupmembership
Once you are approved and tagged as Jr.Spartan, you'll have to do the tasks given in Spartan School section or other tasks in Sparta section.
If you excel in these tasks, you might be promoted to Spartan.
Cryptogirl is the only Spartan member that I know of and Domithra is with the Spartan management.

Hello mates, a lot of guys out there are predicting ETH will fall down to $100. Do you believe this?

Never gonna happen, at least  not in the near future. The reason for the recent dump was speculated to be made by an ICO to convert their raised ETH into fiat reserves, which is a dumb move actually.