FTL geht nicht und das obwohl ich es erst installiert habe

I use php 7.3 as a Debian repository, then I've installed apache2, mariadb, certbot from letsencrypt site and the software updates.

PHP 7.3 isn't part of the latest stable release.
How have you added this repo / how did you install PHP 7.3 ?
This is probably the cause of why lighttpd cant install the libssl1.1 dependency.
Try fresh Raspbian without added repos as you notice it breaks the Pi-hole install.
And you could have mentioned this earlier to safe time.
And you still havn't posted policy as that would have saved allot of time also.

This one will conflict with Pi-hole's own web daemon lighttpd if not manually configured properly.

EDIT: and when I said edit out peronal details from the output, I didnt mean editing out information as vital as " [i] Checking for php7.x-sqlite3 (will be installed)".

now it works after i removed the repository and php7.3, but now my pihole won't block some urls and urls who i added aren't blocked.

Please provide some examples along with corresponding output from /var/log/pihole.log showing the queries and replies.

log:
Feb 28 12:52:02 dnsmasq[5712]: read /etc/hosts - 5 addresses
Feb 28 12:52:02 dnsmasq[5712]: read /etc/pihole/local.list - 2 addresses
Feb 28 12:52:02 dnsmasq[5712]: read /etc/pihole/black.list - 0 addresses
Feb 28 12:52:02 dnsmasq[5712]: read /etc/pihole/gravity.list - 0 addresses
Feb 28 12:52:12 dnsmasq[5712]: read /etc/hosts - 5 addresses
Feb 28 12:52:12 dnsmasq[5712]: read /etc/pihole/local.list - 2 addresses
Feb 28 12:52:12 dnsmasq[5712]: read /etc/pihole/black.list - 0 addresses
Feb 28 12:52:13 dnsmasq[5712]: read /etc/pihole/gravity.list - 112864 addresses
Feb 28 12:52:30 dnsmasq[5712]: query[A] www.archlinux.org from 192.168.xxxx
Feb 28 12:52:30 dnsmasq[5712]: forwarded www.archlinux.org to 208.67.220.220
Feb 28 12:52:30 dnsmasq[5712]: query[AAAA] www.archlinux.org from 192.168.xxxx
Feb 28 12:52:30 dnsmasq[5712]: forwarded www.archlinux.org to 208.67.220.220
Feb 28 12:52:30 dnsmasq[5712]: reply www.archlinux.org is
Feb 28 12:52:30 dnsmasq[5712]: reply apollo.archlinux.org is 138.201.81.199
Feb 28 12:52:30 dnsmasq[5712]: reply www.archlinux.org is
Feb 28 12:52:30 dnsmasq[5712]: reply apollo.archlinux.org is 2a01:4f8:172:1d86::1
Feb 28 12:54:23 dnsmasq[5712]: query[A] www.archlinux.org from 192.168.xxxx
Feb 28 12:54:23 dnsmasq[5712]: cached www.archlinux.org is
Feb 28 12:54:23 dnsmasq[5712]: cached apollo.archlinux.org is 138.201.81.199
Feb 28 12:54:23 dnsmasq[5712]: query[AAAA] www.archlinux.org from 192.168.xxxx
Feb 28 12:54:23 dnsmasq[5712]: cached www.archlinux.org is
Feb 28 12:54:23 dnsmasq[5712]: cached apollo.archlinux.org is 2a01:4f8:172:1d86::1
I go to blacklist at the admin console and make this regex: .*google*.*
but i can nevertless go to google.com or www.google.com