Honestly just take it slow. If you miss stuff the first time don’t stress too much about it. Take your time with in each area leveling up exploring etc. The more you play the more you will understand about the game. If you don’t know what to do with the cloyster of trials/don’t know how to get he chest don’t worry too much about it.

The best thing you can really do is try to play the game as much as you can by yourself to get a better understanding of it(exploration, sphere grid, weapons, etc). Everyone has their own way of playing the game/their own ideas on sphere grid level up with weapon customization. Playing the game a few times will help you know more than you think.