You are welcome, from both of us!
Quote:
Are you a collector or dealer?
I am both sometimes. I buy too many stamps and have to sell some, or I see some at a good price and think I can buy them and then sell them again at a higher price so I will have money to buy more stamps for my own collection.

For you to sell on Stamp Community you must have 50 posts and 14 days in. Please read teh rules and guidelines, button top right.
Delcampe is a worldwide selling auction site, a competitor to
ebay.
ebay is another.
There are Portuguese or Spanish web sites that are auction sites as well, if that is easier for you, although your English is good.
I think selling is fun, so you can tell by that statement that I am not a dealer, who is working at selling all the time.
For other stamps from different countries, please start a new topic for each country in the appropriate forum heading. That way more people will see the title of your post and people that know will help you when they can.
Hint: do not use capitals so much. It is considered yelling on the internet. You do not need to yell. Your words have strong meaning by themselves.