How to set correct permissions on files and directories?

Sometimes you need to recursively set permissions on files and folders, but we have a lot of files and folders and it is inconvenient to write chmod every time.
So we go via SSH, go to the desired directory and execute:

find ./ -type d -exec chmod 755 {} \;
find ./ -type f -exec chmod 644 {} \;

This will set permissions 755 for all folders and 644 for all files in the directory we are in.