Welcome Giorgos,
to the Steemit platform, Yes its happening you are a steemian now. This is the moment to warm welcoming you as a new user. And you receive this message because you used the #introduceyourself tag!
We are in the same timezone!
I was welcomed with good advice too when I started so here i am. I know that steemit may seem very overwhelming right now but don't worry. After a few blog you will be the best blogger and contributor.
If you have any questions just ask your questions on any of my blog posts and I'll be more than happy to assist you with whatever questions you may have!
I may know the answer. But very important I recommend you to never give up any off your passwords they are yours ! Please for safety tips read and visit the white paper or my blog about safety
https://steemit.com/community/@brittandjosie/4-o-clocky-steem-keys-key-to-your-succes-so-secure-them
To easy post use APPICSand to control your account use Steemify.
https://steemit.com/busy/@exyle/using-steemify-to-stay-up-to-date-about-the-blockchain-like-project-destiny-please-consider-blockbrothers-for-your-witness-vote The Steemify App I use is great, it is available in the Appstore and its Free.
It gives you insight on what is happening in your account.
Maybe great to join Steemterminal in Discord and visit 
Here is what we do :
https://steemit.com/heyhaveyamet/@heyhaveyamet/meet-the-hhym-and-the-steem-terminal-crew-part-one-hhym
Good Luck, Have fun and I wish you loads of success on here! :)
Oh and a last tip , this guide :
https://steemit.com/steem/@verhp11/a-complete-guide-for-new-steemians
GREETZ from Holland
Britt
https://discord.gg/pxBj9b
steemterminal discord invite
RE: I am happy to be here!