Anki: How can I mark the cards that I already know in an imported deck?

Question

I'm trying out Anki for myself and I have imported various deck about non-Latin writings systems, some of which I have at least already partly learnt.

When importing an external card deck, Anki will present me with at most N (according with my config) new characters per day. How can I manually mark the card that I already know from the beginning or cards which I learnt from another source ?

examples :

If I only have a small deck, like the Hebraic alphabet or Greek alphabet, I could just temporary raise the number of new cards per day, to set them all as new by quickly browsing the whole deck.

However, if I'm studying Kanji or Hanzi from some specific course and I have an imported deck in which I would like to activate those characters I learnt before or just now from the course. Obviously, I only want to manually add those specific characters and I do not wish to wait until I have browsed the whole deck for those characters I already know, to appear by themselves (which might take years if I'm a slow learner).

There might be two cases :

1. There are some characters that I know and I just want Anki to know it so that it can put them in the review list, or

2. there are some character that I partially know e.g. I learnt them from somewhere but my deck will provide me with more information than I already got, and I want Anki to present them to me right know (put to put them first in the list of new cards) instead of waiting months or years, that I find them by chance when Anki decides to show them to me.

However, this difference is not really important, because, as @Tommi mentioned : Anki will manage. The only really important point is to have (1) or (2) instead of having them presented much later.