Sure, DNS is fairly straightforward, you just set your DNS to whatever the address you want to use is, for example, AdGuard uses 94.140.14.14 and 94.140.15.15 (pick either one, if one seems slow, try the other). The process of setting the DNS address will vary depending on which OS you are using, there are instructions for most OSes available here under Option 2: https://adguard-dns.io/en/public-dns.html
Sure, DNS is fairly straightforward, you just set your DNS to whatever the address you want to use is, for example, AdGuard uses 94.140.14.14 and 94.140.15.15 (pick either one, if one seems slow, try the other). The process of setting the DNS address will vary depending on which OS you are using, there are instructions for most OSes available here under Option 2: https://adguard-dns.io/en/public-dns.html
PiHole is a bit more complex, but basically you’re setting up a raspberry Pi to block stuff on your home network. There’s tons of documentation out there but this kinda gives you an idea of what it does and how to set it up https://www.crosstalksolutions.com/the-worlds-greatest-pi-hole-and-unbound-tutorial-2023/