cadigan

Hello, I am new
to this site ,but I need help

The road trip cadigan
When putting the pieces together, Do I sew the whole thing together
before I work on the ribbing around the collar?
or do I just put together the front and back? sleeves when?

Welcome to KnittingHelp!
It depends on the sweater. There are a couple of Road Trip cardigans on Ravelry but both have raglan construction. Maybe this one?

For a raglan, the top of the sleeves may be part of the neckline. In that case you would join all 4 raglan seams before working the ribbing.
If the cardigan has a shoulder seam to join fronts to the back then you can join that seam then work the collar ribbing. The sleeves can be seamed next.

thanks a lot!!