The server has several plugins that can help a low with building. This guide will go over the most important commands you should remember!
/bu to open the menu. You may toggle options from there. Everything is pretty self-explanatory, so play around with it yourself. Most notable are:
/ncfor noclip (fly through walls)
/nvfor toggle night vision
/thruto go through obstacles. You can also use a compass to quickly teleport around by left and right clicking.
You can use an elytra and fireworks to fly around quicker
/speed will change your flying or walking speed