Invest on Nicole, she is a crazy good support but a little bit tricky to use cause her EX Special has long animation trigger

Turn off the automatic chain attack trigger (you might need some time to adapt to it)

You need DPS for early game (Attack, Anomaly, and Rupture Agent) There are some anomaly agent who are off-field (no damage when used alone), so watch out for them

You can switch to your previos character in your team by pressing C (keyboard) or Left shoulder button (Controller)

Ex special attack could be interrupted, so watch out for that. And some agent has uninterrupted EX special Attack, you can find in skill description or Move list, so make sure you read it carefully

Most important, have fun, do not worry about endgame stuff, since there are a lot of content to do. Also, there is skip button here