Where to go from here

This tutorial has touched on everything that the assembler can do, but it's not really well organized as a reference. the Appendix called Ophis Command Reference is a better place to look up matters of syntax or consult lists of available commands.

If you're looking for projects to undertake, the Commodore 64 and Atari 2600 development communities are both very strong, and the Apple II and NES development communities are still alive and well as well. There's an annual Minigame Competition that's always looking for new entries.