Easy Breeding For Starters

I may not be an experienced breeder but I would say guppies and other livebearers(mollies, swordtails etc) are the easiest tropical fish to breed.

Easy as they are but they seem non-profitable as it's always difficult to find buyers. Thus "no buyers = no profits".

Will hope all the great breeders here to share their vast knowledge on which type of fish are easy to breed and yet in demand to sell for making some profits to reinvest on our aquarium journey.

P.S.
Hopefully this thread will fill up with replies for fish owners like me who want to learn more about breeding.

Cheers!