I award XP for monsters as described & discussed here -
In Classic and 5e D&D I also give XP for gold where the sum is 100gp+, but the amounts are usually lower than in standard D&D.
I give XP for exploration in the same frame as for monsters, but per PC. It's based on the amount explored, depth of dungeon etc. Exploring dungeon level 1 might give 100 XP each, reaching and exploring the 3rd dungeon level might give everyone 300 XP each.
I will also give XP generally for non-monetary goal achievement,in 5e I use the standard XP awards chart. In Classic it's typically on the exact same scale as monsters and exploration, but a major goal gives that amount of XP per PC. So a 3rd level goal - eg a quest achievement appropriate to level 3 PCs - gives 300 xp each.