Adding Adlists to your Pi-Hole
Adlists are lists of domains or DNS entries that you want to route to a “blackhole”, or block. You can add a number of adlists to your configuration.
In order to add these to your Pi-Hole configuration, once logged on, go to “Adlists” on the left blade.

You will see the above, you can your Adlists in bulk as well, just ensure to separate the URL’s with a space.
I use the lists provided by firebog.net, which I have copied below, should be easy to copy/paste.
Lists by Category
Suspicious
https://raw.githubusercontent.com/PolishFiltersTeam/KADhosts/master/KADhosts.txt https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.Spam/hosts https://v.firebog.net/hosts/static/w3kbl.txt https://raw.githubusercontent.com/matomo-org/referrer-spam-blacklist/master/spammers.txt https://someonewhocares.org/hosts/zero/hosts https://raw.githubusercontent.com/VeleSila/yhosts/master/hosts https://winhelp2002.mvps.org/hosts.txt https://v.firebog.net/hosts/neohostsbasic.txt https://raw.githubusercontent.com/RooneyMcNibNug/pihole-stuff/master/SNAFU.txt https://paulgb.github.io/BarbBlock/blacklists/hosts-file.txt
Advertising
https://adaway.org/hosts.txt https://v.firebog.net/hosts/AdguardDNS.txt https://v.firebog.net/hosts/Admiral.txt https://raw.githubusercontent.com/anudeepND/blacklist/master/adservers.txt https://s3.amazonaws.com/lists.disconnect.me/simple_ad.txt https://v.firebog.net/hosts/Easylist.txt https://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=0&mimetype=plaintext https://raw.githubusercontent.com/FadeMind/hosts.extras/master/UncheckyAds/hosts https://raw.githubusercontent.com/bigdargon/hostsVN/master/hosts https://raw.githubusercontent.com/jdlingyu/ad-wars/master/hosts
Tracking & Telemetry
https://v.firebog.net/hosts/Easyprivacy.txt https://v.firebog.net/hosts/Prigent-Ads.txt https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.2o7Net/hosts https://raw.githubusercontent.com/crazy-max/WindowsSpyBlocker/master/data/hosts/spy.txt https://hostfiles.frogeye.fr/firstparty-trackers-hosts.txt https://www.github.developerdan.com/hosts/lists/ads-and-tracking-extended.txt https://raw.githubusercontent.com/Perflyst/PiHoleBlocklist/master/android-tracking.txt https://raw.githubusercontent.com/Perflyst/PiHoleBlocklist/master/SmartTV.txt https://raw.githubusercontent.com/Perflyst/PiHoleBlocklist/master/AmazonFireTV.txt https://gitlab.com/quidsup/notrack-blocklists/raw/master/notrack-blocklist.txt
Malicious
https://raw.githubusercontent.com/DandelionSprout/adfilt/master/Alternate%20versions%20Anti-Malware%20List/AntiMalwareHosts.txt https://osint.digitalside.it/Threat-Intel/lists/latestdomains.txt https://s3.amazonaws.com/lists.disconnect.me/simple_malvertising.txt https://v.firebog.net/hosts/Prigent-Crypto.txt https://raw.githubusercontent.com/FadeMind/hosts.extras/master/add.Risk/hosts https://bitbucket.org/ethanr/dns-blacklists/raw/8575c9f96e5b4a1308f2f12394abd86d0927a4a0/bad_lists/Mandiant_APT1_Report_Appendix_D.txt https://phishing.army/download/phishing_army_blocklist_extended.txt https://malware-filter.gitlab.io/malware-filter/phishing-filter-hosts.txt https://gitlab.com/quidsup/notrack-blocklists/raw/master/notrack-malware.txt https://v.firebog.net/hosts/RPiList-Malware.txt https://v.firebog.net/hosts/RPiList-Phishing.txt https://raw.githubusercontent.com/Spam404/lists/master/main-blacklist.txt https://raw.githubusercontent.com/AssoEchap/stalkerware-indicators/master/generated/hosts https://urlhaus.abuse.ch/downloads/hostfile/ https://v.firebog.net/hosts/Prigent-Malware.txt