Hello again!

I know some of you guys deal with propagation effects, so I figured I
could ask a related question.

In my understanding, a packet is just a way to sectionalize and
categorize individual bits. One group would represent the destination/
address/header. Another would be the actual data (or payload), and
then, maybe a trailer section. Is this a correct assumption?

In wireless transmission, where multipath effects are present, how
does the receiver actually "know" if the order of bits are correct
when processing the packets?

Thanks!