How to build your own router and firewall with Opnsense

Do you like fiddling with computers and fancy the idea of taking on a more advanced project? Then I have a suggestion: Build your own router/firewall.

With a router running a more advanced operating system on more powerful hardware than standard consumer routers, a whole world of new possibilities opens up. Although there is a learning curve and can feel complicated at first, it actually becomes easier to do things that might be possible with a router from, for example, Asus, but are really complicated.