Pi-hole is network-based ad-blocking software as well as a custom DNS server. It uses DNS sinkholing and blocklists to stop internet ads, telemetry etc..
There are several adlists available for pihole, but I would like to recommend following list of pihole –
https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts
https://mirror1.malwaredomains.com/files/justdomains
http://sysctl.org/cameleon/hosts
https://s3.amazonaws.com/lists.disconnect.me/simple_tracking.txt
https://s3.amazonaws.com/lists.disconnect.me/simple_ad.txt
https://raw.githubusercontent.com/StevenBlack/hosts/master/alternates/gambling/hosts
https://v.firebog.net/hosts/Airelle-trc.txt
https://v.firebog.net/hosts/Easyprivacy.txt
https://raw.githubusercontent.com/StevenBlack/hosts/master/data/add.2o7Net/hosts
https://v.firebog.net/hosts/Prigent-Ads.txt
https://raw.githubusercontent.com/StevenBlack/hosts/master/alternates/porn/hosts
https://blocklist.site/app/dl/tracking
https://v.firebog.net/hosts/AdguardDNS.txt
https://raw.githubusercontent.com/StevenBlack/hosts/master/data/add.Risk/hosts
https://raw.githubusercontent.com/anudeepND/blacklist/master/facebook.txt
https://zerodot1.gitlab.io/CoinBlockerLists/hosts
https://raw.githubusercontent.com/crazy-max/WindowsSpyBlocker/master/data/hosts/spy.txt
https://raw.githubusercontent.com/Perflyst/PiHoleBlocklist/master/android-tracking.txt
https://phishing.army/download/phishing_army_blocklist.txt
https://raw.githubusercontent.com/anudeepND/blacklist/master/adservers.txt
https://raw.githubusercontent.com/anudeepND/youtubeadsblacklist/master/domainlist.txt
https://gitlab.com/quidsup/notrack-blocklists/raw/master/notrack-blocklist.txt
https://blocklist.site/app/dl/crypto
https://raw.githubusercontent.com/gieljnssns/Social-media-Blocklists/master/pihole-tiktok.txt
https://raw.githubusercontent.com/Perflyst/PiHoleBlocklist/master/SmartTV.txt
https://raw.githubusercontent.com/SweetSophia/mifitxiaomipiholelist/master/mifitblocklist.txt
https://raw.githubusercontent.com/krombopulosM/TikTok-blocklist/master/tiktok%20blocklist.txt
Other than the list above you can use following regex blacklist to block ads and telemetry –
^adim(age|g)s?[0-9]*[-_.]
^(.+[-_.])??adse?rv(er?|ice)?s?[0-9]*[-.]
^adtrack(er|ing)?[0-9]*[-.]
^advert(s|is(ing|ements?))?[0-9]*[-_.]
^aff(iliat(es?|ion))?[-.]
^analytics?[-.]
^banners?[-.]
^beacons?[0-9]*[-.]
^count(ers?)?[0-9]*[-.]
^(.+[-_.])??m?ad[sxv]?[0-9]*[-_.]
^pixels?[-.]
^stat(s|istics)?[0-9]*[-.]
^telemetry[-.]
^track(ers?|ing)?[0-9]*[-.]
^traff(ic)?[-.]
^(.+[-_.])??xn--
^tiles\..*services\.mozilla\.com$
(^|\.)xbcs\.net$
(^|\.)ads\.roku\.com$
(^|\.)logs\.roku\.com$
(^|\.)avcdn\.net$
(^|\.)cn$
Enjoy pihole and donate if you like the project to support the developers.