How to Block ad’s while playing game, watching video .. etc. without installing any software and browse free.

In Android 9 pie + latest versions.. google introduced a new option called private DNS which is simply dns over transport layer security (DNS over TLS)

open,
Settings => Network and Internet => Private DNS => Private DNS Host Name
Then, Enter any of the following

dns.adguard.com

family.adguard.com // blocks adult content also

ads-dot.securedns.eu

dot-fi.blahdns.com

dot-jp.blahdns.com

dot-de.blahdns.com

adblock.any.dns.nixnet.xyz

adblock.lv1.dns.nixnet.xyz

adblock.ny1.dns.nixnet.xyz 

adblock.lux1.dns.nixnet.xyz

dns.quad9.net // block some ads and malicious domains

family-filter-dns.cleanbrowsing.org // safe browsing block all adult , phishing content