I loved "Stranger in a Strange Land", and "The Moon is a Harsh Mistress" and many of the aforementioned others.
My mum got me into Heinlein & sci-fi as a 10 y/o kid when she brought home "Space Cadet". That was followed by "Farmer in the Sky", "Podkayne of Mars", "Red Planet", "Tunnel in the Sky", "Starman Jones" etc.
His fantasy novel "glory Road" was also very cool.
Trivia time - "The Puppet Masters" was also the basis for an episode of Star Trek TOS "Operation: Annihilate!"
