A Genshin Impact team is a group of 4 characters that you can rotate and use to attack and trigger reactions to do damage against enemies as well as solve puzzles and do other things in the overworld.
This is not the best or the most efficient team. I just like the characters and find the team funny to use.
I use Kokomi as a healer, hydro applicator, and on-field dps.
Beidou is the off field sub-dps on this team with her burst. She can also apply electro - mainly for electro-charged reactions.
With the prototype amber, Nahida can heal the team with her burst. I do this purely because it's funny. Kokomi is a significantly better healer. Other than that, Nahida is also a great support as she buffs the team's reactions, and she's an amazing dendro applicator for bloom.
Kazuha is mainly in my team for more efficient overworld travel with his e skill. He is also great at grouping enemies and the viridescent venerer artifact sets allow his swirl to be very helpful. He can also occasionally hyperbloom if he swirls electro.
Things to check out: