Cloudflare

When on Cloudflare, on the left you got a sidebar, click on DNS and then go to "Records"

Then create your A record

In the "type" box select "A"

In the "Name" slot you can put numbers, letters or "@"

You may be wondering what is the name slot, we can say it's your domain prefix.

Example: I own Example.net, if I set "name" to play I have to put play.example.net to join my minecraft server

Else, if I put @ in there, I can join with example.net

In "IPv4" slot you will put your server's numerical ip

You may be wondering "how do I find it, it's showing a subdomain" to which I will answer with: there is this tutorial

You may want to set this up if your port is not 25565

Create a second record

Make sure the "Type" is SRV and not A

In the "name" slot you put the same words you've done for your A record E.g. @, mc, play

In "service" slot put "_minecraft" (without the quotation marks)

"TTL" should be "Auto"

"Priority" should be a low number e.g. 0 or 1

"Weight" should be below 5

"Port" is your server port, which can be found in the console

"Target" has to be set to your domain/alias shown in the panel (view picture below)