Find an area that interests you, and try and get involved.
I’ll suggest
FYI: How teams communicate can vary; many use IRC, but others use other means (eg. telegram etc) You can learn a lot my listening in before you speak up (ask to get involved). No need to fear saying you’d love to help, most teams will LOVE someone expressing interest! though be aware people work in different time-zones and real-life commitments do mean responses can be delayed.