Pretty Fly is correct: BitDynasty is the god of Conquest, with theory-crafted teams given to you and links directly to the time stamp of a sector march where those teams are tested. You can also just watch the whole march through a sector to see successes and failures, etc. You can learn a lot about which enemies to avoid while feat farming, bc those farming teams do their jobs well when they're allowed to, but counters are counters and you don't want to waste energy.
Here's the direct link to one of the most helpful SWGOH sites on the internet:
https://swgoh4.life/conquest/