Remembering and analysing quotes:

Key themes because they link to most of the characters at the same time - although do make sure you have at least 2-3 for each of the main characters because basically any of the key ones can come up

How would u link it to questions you have on characters

For example, for An Inspector Calls, you might use the quote "But these girls aren't cheap labour - they're people" to link to the themes of responsibility, class, gender, exploitation etc. This quotation is one of Sheila's, but also links to the "millions and millions and millions of Eva Smiths and John Smiths in the world" i.e. the exploited proletariat.

Sorry but I don’t get it cause I don’t do inspector calls😔

Basically one quote links to one or more themes, but always links to one (or more) characters, so you don't need to worry about which you're doing, as long you can link the quotes you have picked to all the key themes and characters

Wouldn’t it be the same thing though if you did it for characters

Sort of yeah, but I liked to sort my quotes into themes so that I would know what three points I could make if a certain theme came up as I wanted to cover my bases. For example, for the Christmas Spirit in A Christmas Carol, I could have 2 quotes about how it makes people feel uplifted and purposeful, 2 quotes about how a lack of the Christmas Spirit can affect you negatively and make you isolated and morose, and a final 2 quotes for another paragraph based on how the Christmas Spirit can be used for a change in society.
The quotes for a theme will likely have a variety of characters involved, but the quotes for one character might only touch on e.g. two of five of the key themes. But if the theme and character quotes are the same for you, then it really doesn't matter, right?