Through Curve Mesh (aka TCM) requires a minimum of 2 section and 2 guide inputs (referred to as 2x2). Studio Surface can be a combination of fewer, down to 1x1. There are other slight differences, but not important for you to understand at this point until you have a firm grasp of the fundamentals of surface modeling.
Read over posts from a user named surfactant in the past few months - that will have plenty of information to help get you started in the right direction.
Tim NX 22.214.171.124 MP11 Rev. A GM TcE v126.96.36.199 GM GPDL v11-A.3.5.1