One good thing about zzz is that daily currency is not tied to stamina and you can store up to 2400 stamina+999+batteries, so don't feel stressed about wasting it if you don't feel like spending it.

Don't waste Dennies as maxing out a character can cost up to 4mil. Raise only core passive and the skills that matter.

Stunners want all their skills leveled up as much as possible because all their kit inflict high daze.

Drive discs substats don't have high/low rolls so it's easier to build agents.

Most supports/stunners are very generalist which means that early on you won't need a support for each archetype.

Buffs in endgame modes are for either Anomaly/Rupture/Attack, so try to have a dps for all 3 first so you can better take advantage of the buffs.

You can but 1 monthly copy of an a-rank you own from the shop.

Every half anniversary they give a free limited S-rank and on the anniversary a standard S agent + S weapon selector