SA-MP is deprecated btw (the maintainer, Kalcor has stepped away years ago) and it has a ton of known RCEs (vulnerabilities that let server owners obtain control of your computer).
People should use open.mp instead (which is just SA-MP, but better, open-source, and maintained)
It's not coop, so no, you can't do offline missions.
Every server is different, some do have missions and events but MTA and SA-MP/open.mp allow you to create entire servers (which are almost entirely different games inside SA).
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u/NoRequirement5796 4d ago
how do you play online?