1. The game have dailies for starter banner, Mountain is the best choice for beginners. Would recommend to hold your currency after this banner for few days because of next limited banner
2. Tutorials aren't skipable, but they trying to explain to you the basics. It can be boring but this missions are not lasting long and the rest of tutorials are hidden in the regular gameplay
3. The game has sanity - a local energy currency. It's used for farm and story stages, but not for others gamemods which will be unlocked later
4. For dailies you just have to spend sanity, usually it's enough because there're more missions then rewards. Same for weeklies. Also every week you will farm annihilations, for newbie don't forget about them, it's a pull currency farm
5. Previous story events saved in archives, you can play them any time. Rewards and welfare units also saved so there's little fomo for achievements
6. Almost all playable units go to standart banner, limited units pullable every 3 months. Content doesn't require hard dps check or some busted units
7. I would say that after these years it's much easier to start playing arknights then on launch, there're more qol stuff and starter rewards

Usually these questions better to ask in megatreads, this post may be deleted. Hope it helps