That's more of an intermediate level; I think https://www.redblobgames.com/maps/terrain-from-noise/ is a simpler place to get started. For concepts ("frequency", "octaves", etc.), see https://www.redblobgames.com/articles/noise/introduction.htm... but I would recommend starting with the practical page and then reading the theory page afterwards.

Also, there's a procedural generation reddit (https://old.reddit.com/r/proceduralgeneration/) which has resources in the sidebar and there's also a procedural generation discord https://discord.gg/67yD223