My favorite forum is closing very soon and I want to copy as many threads as possible. PDF format works for me, but if you know any other way I am happy to hear it. Not much knowledge about coding though.
You will need an "Offline Browser", there are quite a few available but HTTTrack is (in my opinion) the best. Read their manual for more on how to use it.
I would recommend HTTTRACK as well. Check out MakeUseOd review for instructions under the link below.
Save and Backup Websites with HTTrack