What kind of Minecraft server is it?

I recently saw a YT video where someone showed how he got so good at Minecraft. There was also a server or something where you can learn speed bridging. Below is a picture of the section in the video where you can see it.

Where is that? Or. Where can I do this?

thank you in advance❤️

There are many options for the Minecraft Java Edition: GommeHD has a training mode, McPlayHD.net too (uses a larger English bedwars youtuber). Or what is easiest: create a normal world, give yourself blocks and then practice

This is the McPlayHD server. Is even in the video description.