For newbies especially FRA can be quite tiresome, confusing and with very long walks. It took me a few transfers to understand that the onmipresent free golf carts are not only for handicapped people. You can ask any security or gate person to arrange one. There are two enormous benefits, apart from the convenience of not walking for an eternity. 1) The carts pass through separate security lines so there is generally zero wait. 2) They take you between terminals and concourses very quickly (C16 to B22 took me only seven minutes a few days ago this way. The last time I walked it I needed 35 minutes, most of it waiting in security lines) The people who drive the carts are very helpful and kind, as are most people at FRA.