For some reason, I had never read the GNU definition of free software. Very interesting thanks! One question though, did I understand it correctly or have a go

For some reason, I had never read the GNU definition of free software. Very interesting thanks! One question though, did I understand it correctly or have a got it wrong: I can make a free software (free as in speech), and charge you X amount of money for it, but it is within your right to sell it to the next person as long as you keep the freedom to modify etc?