The cards that you are already familiar with are called known cards. On the known cards page, you can add cards that you already know the meaning for.
Click Add Cards button
The popup window for adding cards appears
You can enter cards one per line and click the Save button.
Now, cards have been successfully added to the list. Besides manually adding cards here, you can mark any card as known if you come across it.
On the community page, you can mark the card as known if you know its meaning.
As you search meaning, you can mark the card as known.
As you study, you can mark the card as known. As soon as you mark that card as known, it will no longer appear in the study.
View cards section allows marking multiple cards as known.