[splittingTimes]

Play with the application. In each of the main views try to find prominent/unique label strings. Search for those labels in the code base to get an entry point to the view. Then explore the code around that entry point and try to change something here and there and see if it has the effect you expected.

Other then that there is not much to that you would not do in other code bases as well. Set up your IDE probably do you have all the linters ready and can easily navigate the code base.

Ask your lead or mentor to show you the low prio backlog Tickets that have 1 or 2 story points and start the to get your feet wet. Once you have solve one, ask how your commit process works and follow it. Rinse and repeat three times then pick a ticket from the Sprint filter and start contributing.