Internet bridge from house to shop.

Cat 5 cable has more twist than Cat3 and uses 2 pair inside of the 4 pairs. Most are UTP (UN-Shielded Twisted Pair)

Cat5e is 10 times faster than Cat5 due to twist and it uses all 4 pairs (8 wires of the 8). Most are UTP but some are FTP

Cat6 is 100 times better than Cat5 due to tighter twist and real separation of the 4 pairs. Some are FTP (Foil shielded Twisted Pair) or STP (Shielded with a braided metal like coax).
Most have a copper wire inside called a DRAIN and must be bonded at the Distribution Frame end. Any high current will flow to ground, like LIGHTNING.

You jack or crimp Cat6 the same as Cat5, same RJ45. Its the cable between the jacks that matters.

I have terminated 25 pair Cat5 cables on the old AT&T 66M blocks. AT&T 110 blocks are better.