Hello,
I read many things about transfees(not be included in a block)
Any I saw many transactions without fees and still getting confirmed.
How is that possible and how can I actually do it?
Well the rule of thumb is never send a transaction without a fee. It may take a month to confirm. The prioirity is low for such transactions.
I got some transactions with no fee and it didn't took months. Just 14 hours for the first confirmation.