For gigs. Practice how you play. Sure I can practise the act of making the right notes by sitting in front of my computer. But there’s more involved in a gig and I learnt it’s worth practising it all (as much as feasible). Stand up, guitar into pedals into amp, mic on mic stand (plugged into some speakers if possible). On stage it’s easy to forget shit like this-pedal on/off now or shit I’m s’posed to be at the mic right now. And then just general stage presence. Open mics also great practise grounds.