European trains are the easy, calm way to cover ground, but the booking can feel confusing the first time. A few rules make it simple.
For long, fast routes between big cities, book a few weeks ahead to get the cheap advance fares, which sell out as the date nears. For short regional hops, do not bother booking ahead at all. The fare is the same on the day and you keep your flexibility. The common mistake is booking everything in advance and locking yourself in.
Use the national railway's own website or app where you can, plus a cross-border trip planner to see all the options in one place. Reserve a seat on the high-speed and scenic lines, especially in summer. On regional trains you just hop on. Screenshot your tickets too, because phone signal in a mountain valley is not a given.
A rail pass only pays off if you are taking several long trains in a short window. For a slow trip with a base and a few day trips, point-to-point tickets are almost always cheaper. Work out your rough route first, then decide.