Since we can’t see your diving history with you posting anonymous it’s hard to tell but many liveaboards prefer you to dive with EAN since help if you get bent could be hours or days away.
If you go to a resort where you could dive 4 times a day you’ll run out of bottom time on air.
Even a 2 tank boat trip could limit your 2nd dive breathing air.
And when you get old you might have circulation issues, remember the tables were written for young sailors in good health. So when you see an old diver and his tank says Gezzer Gas it’s EAN and he is using air tables for a safety buffer.
There are no check out dives required, just a test so yes, take the free course.