I think what you mean is using the keepinv command in the console and that is very easy if you know how to open up the console because all you need to do is type in /gamerule keepInventory true
Hi so I watched the video and did the steps; saved the mode as hard and restarted the server, but when i joined again the difficulty was still set to easy. I am not sure why this. Even on minehuts website it says the server is hard but in-game it isn't.
I actually figured out that an op (me) can change the difficulty in game with the command /difficulty hard.