Minecraft java only for certain laptops / pcs?

Is it true that minecraft java can't run on some PCs / laptops?

No.

If the hardware is too bad, the game won't work. But I think that every PC packs minecraft.

Okay, because someone said that in a discord support part because the minecraft launcher keeps closing when installing and gives me an error message.

Minecraft Java is platform independent. That runs on both Windows, Mac and Linux.