Let me chime in and say, Michael W Lucas has an awesome book about FreeBSD Jails. I bought it recently and I read the whole thing and it helped me a lot. I still had to figure some things out by myself because the book is for a slightly older version of FreeBSD. But it is an awesome book.

I use only the tools included in base system for setting up my jails. No “ezjail” or anything.

If you read his whole book you will see how it might be the correct choice to just do it yourself. Depending on what you want to do etc.

For me I am definitely much better off having set it up myself with the help of mwl’s book.

https://www.freebsdmall.com/cgi-bin/fm/bsdmjails

Buy the physical copy of the book.

PS: Use vnet interfaces for most of your jails.