How to get there?
By plane:
Most of the cheap airlines (Easyjet, Ryanair) fly into Basel Mulhouse Airport, which is only a 15 min ride away from the city center. But remember: flying is bad for the environment!
By train:
Take the ICE from the bigger cities in Germany. Take the TGV from Paris. Both will transport you fast and comfortable to the Basel SBB trainstation.
By bike:
Ask google maps to give you a routing to Basel, Switzerland
By car:
Type Basel into your navigation and follow the instructions