Help understanding pivoting and port forwading

I am trying to learn about pivoting/port forwarding and how to take full advantage of it. If I am connected to a network with the ip and can see that has access to a website hosted on I am able to gain access to the webpage using meterpreter by doing:

meterpreter> run autoroute -s meterpreter> run portfwd add -l 8080 -p 80 -r 

and then localhost:8080 in a web browser. From here I can use meterpreters TCP scanners to see there are other machines on the 10 network.

My question is, how can I then attempt to gain access to another machine, say brute force `′ ssh port?

Also in an effort to gain a better understanding of what metesploit is doing, how could I also achieve this setup with proxychains? and would this allow me to use the kali tools on my host: directly on the target network 10 network?