my bookmarks on my safari keep disappearing/not saving - MacBook Air Monterey

Hi tattooeduk

Wondering if you are using iCloud ?

If your iCloud or Safari bookmarks aren’t syncing - Apple Support

And

If needed:

You can restore your Safari bookmarks and reading list from an earlier version

Restore your Safari bookmarks and reading list on iCloud.com – Apple Support

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Else:

Apple support's article on bookmarking with Monterey:

Bookmark web pages that you want to revisit in Safari on Mac – Apple Support

Personally, to bookmark a page I am viewing on Mac, this method seems quick and reliable:

Press Command and the D key at the same time /

(you can now choose the folder to save the bookmark in)

then press Add .

All the best :-)