How do I make a skyblock client/mod

I've seen many video's on making Minecraft clients, but all/most of the skyblock clients have the same look, like there all using a template, for example, patcher and other clients all have that dark grey and greenish text, and alot of cheat clients like rosegoldaddons and shady addons all have

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How do I make a skyblock client/mod

Idk what happened but Lunar client doesn't show me all the mods after I go back in the game. : r/minecraftlunarclient

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How do I make a skyblock client/mod

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