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Use the links ending in .ics on this page: from Calendars
Android & Google Calendars
Our central calendars are already in Google, so if you happen to use Google Calendars you can just add them directly. Android phones are of course also Google-based so they integrate similarly
https://support.google.com/calendar/answer/37100?hl=en&co=GENIE.Platform%3DDesktop&oco=1#
Follow the guide and use the links in Calendars
MacOS
https://support.apple.com/guide/calendar/subscribe-to-calendars-icl1022/mac
Use the links ending in .ics from Calendars
Other Apps
Google it! And use the .ics links from Calendars