free e-books

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Apart from your library where you can borrow free books retailers also offer them

I think you need a tablet or a smartphone to read those:
www.sainsburysebooks.co.uk/collection/1000-free-ebooks
www.sainsburysebooks.co.uk/how-to-read-ebooks

I've bought books from Sainsbury ebooks. You can. download onto a Kobo or similar ereader but not a kindle.

I get quite a few free and cheap ebooks from here uk.kindofbook.com/

They have free ones daily.

I subscribe to Bookbub. It's free and I get an email every day with free and reduced books.

duchess I assume you mean the books are in ePub format? There are converters to change them into mobi. That can be copied onto the kindle.

Look at a ebook manager like calibre.

Yes I probably do mean that Terrors but don't understand Calibre and can't be bothered to try