Protect wp-admin

CAn i know who logs in the back-end of my wordpress installation?

Only people with accounts on your site can log in, so if you’re the only one with an account, you’re the only one who can log in (as long as you have a password that can’t be easily guessed).

If you aren’t the only one with an account on your site, you can keep track of things with a plugin like https://ww.wp.xz.cn/plugins/aryo-activity-log/

There are a number of plugins available for that: https://ww.wp.xz.cn/plugins/search/change+admin+url/