Hello Phaubauyull53
I see.
Again, you will spend a lot of time in trains, to commute from Geneva to the countryside and back. Keep in mind that the daylight is getting shorter with every day now. Furthermore, delays on the Lausanne to Geneva route and v.v. are to be expected due to ongoing construction works.
To answer your question: you can use Supersaver tickets, Saver Day Passes or Point-to-point tickets, whatever is available and the most economical. Check the offers using sbb-tickets.cc.
Make sure you purchase them at full fare if you do not have the Swiss Half Fare Card in addition.
Whether the Swiss Half Fare Card is useful depends on your other travel plans. As a rules of thumb, if you are going to spend a total of CHF 240 on travel tickets, the Swiss Half Fare Card will pay off.
Kindly note the conditions on Supersaver tickets which are only valid for a specific connection chosen upon purchase. If you miss the departure time the ticket is no longer valid. They are in particular not recommended when you arrive by air.
Kind regards,
Roland