-Fishing into trading - imo its not worth the effort to go extra distance to sell fish. Imperial the fish is good enough
- Cooking - yea you would have to keep checking your PC and wont get any work done, unless you are doing some really simple dish with slow cooking speed
-Training - you can train horse to a certain level, then breed them, and then sell them to imperial vendor for t10 mats. Or if you want to spend the irl money to try to get t8 coursers you can sell those in market
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afk sailing - is mostly bartering. I dont think people do hotspot fishing anymore. Bartering you need to check back once in a while.
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alchemy - yea same as cooking but need more brain power trying to gather all the materials...
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there is also afk processing too, you can process things you might need for other lifeskill