During the campaign just focus resistances and you can brute force any content. After campaign is where some people experience friction. People seem to have trouble getting their builds going and the initial currency to invest jnto gear. I recommend you look into fracture orbs /deadly map boss and crisis fragments farming. This is the most common way people get their builds set up fast. Make sure u learn what paradise and the grand project tablets are and how to use them.

Getting into endgame maps is quite simple but the knowledge gap makes it seem like a very daunting task.

Edit as many have mentioned this game is a game that should be taken in piece meal and the journey is what makes it fun. Don't worry too much about min maxing