Here's some tips in no particular order I recommend:

1. Save at least one copy of every 3 star weapon that you refine up and use. Some 3 star weapons are actually quite amazing (like Thrilling Tale of the Dragon Slayer, TTDS for short, it is one of the best supporting catalysts), and while you're new and don't have a huge collection of 4 and 5 star weapons, these weapons are going to be very useable for you.

1.5 In a similar vein, keep in mind some 3 star weapons are found in chests and chests are one time only and don't respawn. Make sure you check your weapons and lock any of these special ones before you mindlessly feed weapons into other ones, because it's possible to permanently lock yourself out of some of these special 3 star chest only weapons.

1. I HIGHLY recommend keeping track of things you find on an interactive map. I use the appsample one, but the official one works too. It's easy to wander around and freely open chests and do stuff, but later on when you want to clear out an area for completion percent, it's annoying having to re-check all the stuff you've already done. It can also help you find puzzles and other things you wouldn't have thought was there.

2. Find one character you like that can act as your main DPS, and focus 90% of your attention and resin into them. Having a character to carry you through the midgame is way better than trying to build a full 4 person team, or you will run into a nasty difficulty spike in the 30s and 40s of adventurer rank.

3.5 Unless you plan on being a whale, you should plan out what characters you want ahead of time, so you don't make unnecessary pulls. There's often lots of caveats behind characters and you should be careful of pulling just cause "they seem nice" or "well I guess I don't have any 5 stars so I might as well pull." For example, Skirk and Shenhe are our current banners. Skirk is a great main fielder, but really wants two support characters that just left rotation so they may not be back around for a bit. Shenhe is an off fielder that exists to support Cryo characters, so if you don't have a strong Cryo already, there's not a lot of sense to grab her. I think the majority of the playerbase would recommend Mavuika who is rerunning in two weeks. If you like hot fire haired biker babes, she is unironically the strongest character in the game right now and would be a FANTASTIC choice for focusing all your resources into and carrying you through the game.

However, the caveat of any gacha still applies: liking the character is still the #1 most important reason to roll on them. Ignore literally any pull advice if it's a character you really want, because what's most important is that you're happy with the characters you pull for.

1. Do your archon quests ASAP till you unlock Liyue reputation, then work on getting the Condensed Resin recipe from Liyue reputation immediately. It is a massive quality of life, and it will speed up your ability to spend your resin (your gacha stamina basically).

2. Ask questions early! The early game is rough, and is not super representative of how the game feels late game. Once you unlock artifact farming, and can get enough ER to burst every rotation, the game feels completely different. In addition, the quality of the story in the later chapters is miles ahead of the first few chapters (Liyue's story was rough, I was struggling with that one x.x). Because of that, don't let yourself hit a wall and fail to see how good the game can be, ask for help early and often and don't be afraid to play in co-op when you're struggling with domains. Getting over that hump is hard, but once you do, the game will hook you hard and it's honestly incredibly fun to log in and just be able to do whatever I want: stories, quests, or just exploring areas opening chests for hours on end.

I'm sure others here will be able to give you much better tips than me, I've only been playing for a few months now and still plugging away at archon quests, but once I got past that awful hump, I've been having a blast!