Classic way: set fixed ip adresses like 192.168.0.1 and 2 and subnet 255.255.255.0.
Manjaro side you need support for reading and writing to windows shares. This is called samba.
Nachlese is right about the special cable, but nowadays (if the pc is about 10-15 year old) the network card support automatic crossover, so chances are - use any cable lying around (well, if all 8 wires inside are connected you will have 1 Gbps, otherwise 100Mbps).
For 1-2 files and occasional share i save myself the samba setup and use a program called LocalSend.