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Basically you just use the cardbacks to make them indistinguishable from a normal card then put a note in if using sleeves (that way they are reusable as other cards) or write on them if not (but then they are obviously not reusable as other cards). You can find descriptions for all the cards released on arkhamdb.com and you can set the language to German. I have done so myself to be able to include a few cards from circle undone which came at a time when I did not have time to play the game and I have been waiting for the re-release of.
Obviously not as nice as having the real cards and unless you are using sleeves you can’t do it for every card, but a cheap way to use that one card you really want to have in your deck without buying a whole expansion for it.
I read the manual and then I search the internet for any rule unclarity to se if there is an answer (errata, FAQ, community consensus). Almost never watch videos, don’t learn from them as well as I do from reading. Usually read the rules if I’m going to introduce someone new to the game even if someone previously explained it live. Have had to many cases of someone teaching the rules wrong, to blindly trust someone (except like one other person I know who is usually correct about everything)