Don't let them bully you. You can play conquest however you like. Most players have huge egos and want to trash talk unless you play it the basic way. The worst is conquest. They need to get over themselves unless playing ranked. Here is the gist of it.
Solo is opposite carry/ support lane. Mid is middle. Jungle is everywhere.
Solo- warrior A.K.A. high sustain
Mid- Mage, short lane to hold the line
Carry- Hunter, supposedly keeps the team alive while ganking ( backwards with support in my opinion)
Support- Gaurdian with strong support abilities to support the hunter and then the team towards late game. Healing support helps most. The common misconception is that it has to be a gaurdian. It can be any god with powerful support abilities. I personally think hunters make the best support. War banner and attack support armor amps up most hunters that devestate with attack speed.
Jungle- Assassin, moves within the hidden areas. The biggest misconception is that jungles are supposed to stay in jungle. Their main goal is to keep their jungle in check (not kill your teammates) and to support all three lanes (especially solo.) Jungle should also help get jungle buffs when possible. The jungle can be anyone with speed. NEVER A SLOW GAURDIAN. Number one priorty is to keep up/ kill opponent jungle, and be fast enough to help all three lanes.
I do suggest trying out the basics, but never let that stop you from experimenting. I learned much better strategies my own way.
Anyways, back to the question. I learned by experimenting and playing a lot of rank.