yeah the tl;dr is DON'T pick up any bright or exotic engrams, let them rot on the floor and they will go to the postmaster, don't grab the free ones the bald guy or tess @ eververse give you. Wait until your blues level you up to 260 or 265, then start getting bright/exotic engrams. The engrams pick the level when you loot them, not when you decrypt them, so waiting until you are 260+ is better.
From 200 (what you are when you hit 20) to 265 just do lost sectors, PVP, and heroic strikes for blue gear, you no longer "have" to equip higher level gear as it figures out the highest item in that slot but you may as well, right. Same old kinda grind as D1. Public events are good too, especially if you can convert them to heroic (hard if other low level people are doing it too)
DIM works in destiny 2 as well, just select Destiny 2 in the top right (and the platform) mobile or chrome and you can move stuff around chars from your browser/phone.
Destiny Item Manager