Can you please help with train recommendations from Munich to Lauterbrunnen? Appreciate any recommendations, traveling in a couple weeks. Thank you!
Have you explored the Seat 61 website? That might be helpful in describing the options so you can determine which route best fits your plans.
You need to buy at least a Swiss Half Fare Card:
https://www.sbb.ch/en/tickets-offers/tickets/guests-abroad/swiss-half-fare-card.html
Then book the shortest time in takes here
https://www.sbb.ch/en
www.sbb.ch/en or https://int.bahn.de/en will show schedules and sell you tickets. They run the railroads between them, so they both sell tickets and have accurate information.