deleting old revisions of posts – how?

I recommend using https://www.ads-software.com/plugins/wp-sweep/ for that.

i will check it
thanks

it says:
“havn’t been checked with you wordpress version”

should it be ok? (hebrew wordpress)

Yeah, that will be fine for this one.

THANK YOU

is there a simple way to delete them but keep the 10 revisions intact?

Do you mean only keep the last 10 revisions?

If so, try this: https://www.ads-software.com/support/article/editing-wp-config-php/#specify-the-number-of-post-revisions