Anyone got tips for wholesale?

Title says all, im new to the game, im trying to buy cheap, sell high. i dont wanna buy truckloads, just boxfulls of a unit.

what are some items trending right now i can get cheap in bulk?
what are some websites that are trending i can use to resell?
Are there any certain currency you need to buy the items in?

dont try to wholesale first just sell products you think are good for wholesaling in the future as you work ur way into it