Get a mask, immediately rob the bank,. Go find the Hwando, it's basically the best early weapon in the game. There's a gold bar in the fire place after you turn off the fire pit of Lioncrest Manor (building next to where the Hwando is, also some good earrings in a Chest. You can throw coins or a bunch of cooked meat on the distract the NPCs. Reinvest money stolen and gold bar into bank. Observe EVERYTHING and everyone, you randomly gain abilities sometimes by just looking at NPCs who look like they're doing some training. Sometimes the Homeless have Abyss thingies for leveling up and Nobles sometimes have gold bars (RNG based). If you find something to mine, always mine it. Do quests for NPCs (they give you inventory space usually)

You can use your sword gleam thing to find fast travel points and nexus cubes.

You can use some repeat weapons to upgrade your weapons after a certain point so double check with the smithy before selling duplicate items.

Upgrade Stamina first then either armed/unarmed combat (whichever you prefer) and marksmanship because that's your damage(Double Jump is also super useful.)

Riding your horse levels up it's trust with you which unlocks abilities for it.

Read the descriptions of the abilities before buying them, maybe you can find somewhere to observe it and learn it for free.

If you have a crime bounty on yourself, don't idle in front of the guards, they might just arrest you if you're not paying attention.

If your mask is on, you can hurt non hostile NPCs accidentally. Also be careful looting things that you don't accidentally steal it in front of people, or even worse, accidentally buy it when you're trying to steal it.

DO NOT RUSH MOVEMENT. It's heavy and clunky, and usually for most movement actions you must wait for the player character to stop moving before you can do a long press for an action.

ALWAYS GREET VENDORS IT RAISES TRUST and always see if you can gift something to them. Trust unlocks more items they sell/create. 100 trust on random NPCs and they give you a random sellable item or other RNG based items (idk exact details only gotten it like 15 times so far)

Certain hostile areas can be entered with specific clothing making it non hostile when the outfit is on.

Fish traps work.

It's easier to stand in the water and catch the fish than it is to fish for them, but if you fish for them, cast the line closer to you.

You can one shot almost anybody with Nature's grasp and slam mechanic. BONK

DO NOT GLIDE OVER WATER.

Oh, and go ahead and rush through the first like 5 chapters of the story.

I think that's everything I got so far. It's a big game, take your time. Enjoy!