I started programming on the Atari ST and bought a compiler and made a fractal program based on the computer magazine examples of the time (not too much earlier, we typed in bytes and ran a checksum to get the computer magazine examples to run on something like a Commodore 64 for those who did not learn 6502 assembly), for fun as you say and posted it on BBS. I got a really nice handwritten letter of appreciation from a couple who enjoyed playing with it, it was immensely gratifying to make something and share the joy of playing with it.