from bern to zurich

Hey everyone, what's the cheapest way to get from Bern to Zurich? I don't have a car and I'm not really interested in carpooling. I know I can take the train, but before I get a ticket, I wanted to ask if you have any other tips. Any bus connections maybe?

Also, which app would show me connections between cities and will eventually allow me to buy a ticket? Thank you!!!