There are several types of bindings, which is why it is important to choose them carefully: SNS Profil, SNS Pilot, Prolink, NNN, Turnamic.
Some have afts, others have single rails. They are sometimes compatible with specific brands of cross-country ski boot soles or sometimes compatible with most brands.
Don’t hesitate to ask for advice when you get to this stage.
Cross-Country Skiing – Bindings