COMBAT

If you've played the previous game made by miHoYo, you already know this: The enemies are heavily pattern based and learning the pattern will save you alot of time. Special defense mechanisms are also important. Wooden Shield? Burn it! Stone Shield? Break it with a claymore/heavy attacks! Has a bubble where you can't deal high hits? Use a fast attacking character and keep the burst until the bubble is down! It is actually very simple once you give attention to these things.

Some other things to keep in mind is that any archer, such as Amber, is a good character to initiate fights to fight in between obstacles. But don't lure them too far off, or else they will run back and reset their HP!

Try to memorize the elemental reactions as soon as you can. Triggering combos can save you a lot of time. In case you did not know: You can insta-switch charaters in with an ultimate cast! Check your keyboard/controller binds for this. You can chain-combo multiple ultimates to pulverize large groups of enemies or a stunned/stagnant boss.

Beginner example: For a boss fight, switch to Kaeya and use his ultimate for aoe ice damage then immediately switch back to your hard dps character.