I guess it’s a very newbie question, :)
How can i press screenshot and then the picture will be automatically saved in a specific folder? (when i do that always appear screenshot manager slowing the process)

EDIT: So far i found this link https://ubuntuforums.org/showthread.php?t=1980952
If someone else is trying this:
install scrot
then run command like (you need to create the folder where you want the pictures)
scrot ‘%F_%H.%M.%S.png’ -e 'mv $f ~/screenshots/'
You can create a script file and add some keyboard shortcut to avoid printing the terminal together :)
For the script, open an editor and use the command above then save and change it with chmod to execute it.

If there is another way i’m still interested to learn.