Explaining Ports

You may be wondering, as support of a Booter, what do you get asked the most about?
Well, that would be ports. People simply do not understand ports, so real quickly, I am going to explain it.

Which port should I use? You use the one that is open, that's really all it is, if you find a port that is open that's the port you should attack with.(Most likely that would be 80 or 53(UDP) cause those are usually open by default)

How do I know if the port is open? Simple, you use a Port Scanner/Checker ( http://www.yougetsignal.com/tools/open-ports/ I use that for UDP ports and https://pentest-tools.com/network-vulnerability-scanning/tcp-port-scanner-online-nmap this for mass port scanning/TCP scanning. )

Different types of ports?: There is a UDP port and a TCP port, if you find a TCP port, you use a TCP method(if you're using ipbooter.com that would be something like VSE or ESSYN) and if you're using a UDP port, you would use a UDP method (Again if you're using ipbooter.com that would be DNS, LAG, NTP, SSDP, or LDAP)

Is there a reason to use one open port over a different open port?  Usually ports will have some sort of firewall telling it to drop the packets received if they are over a specified amount, however using something strong like ipbooter.com it will bypass the firewall with 0 problems.

All the ports are closed?! what do I do?!? There is a difference between closed ports and filtered ports, If the ports are filtered it just means the firewall is sending a false flag, basically telling you that all ports are closed on the router you are scanning, there is most likely one still open, while this is annoying to deal with, you can still bypass it. (Simply from guess work, and research, for instance, if you know that they use Xbox Live then it is safe to assume they have an Xbox Live port open(otherwise the service wouldn't work)
(Xbox ports: Port 88 (UDP)
Port 3074 (UDP and TCP)
Port 53 (UDP and TCP)
Port 80 (TCP)
Port 500 (UDP)
Port 3544 (UDP)
Port 4500 (UDP)
)
And you can always just try the default ports, (however usually if a routers port is filtered port 80 is closed, 53 sometimes will still be open. And if none of that works, you can always just keep attacking with different methods and different ports to see if you will hit the jackpot. )

Well for  now that's all I can think of. i'll add more in the future as more people ask me questions.