Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Starting at golem's is better with the e reset. If you're red side, you should start gromp for the pull though.
Just go in bush, use w, and e in. Flash sumonner spell is important for e flash auto on some ganks.
If mid is pushed, hide in raptors, use w, then dash over the raptor wall. It avoids being seen by wards.
Front ganks on bot and top are really efficient if you can reach first bush without being seen.
Basic fighting mechanics
You can just e, auto and enable hydra for the auto reset with devourer to pop the third passive mark. Thus, you can keep your q to slow the enmies if he flees.
Use w on the enemies, dash in. If you can wait for your ult to be at the same position than you to gain some time for w to pop, it's better. If you take too much damages, just ult backwards.
Focus the carries, your dash should allow you to pass through frontlane.