Animefan8888

Take a look at that items texture along with the .mcmeta file with the same name as the image. Or look at Minecraft's water/lava texture and their .mcmeta file.

A world capability is just a wrapper around a WorldSavedData anyways.

To use that method you need to implement ITickable.

You never use Which you first need to initialize a lot like you do your nbt variable.

You're probably pretty much on your own for this. You've been presented with to options, the BufferBuilder route which may lead to an abrupt dead end or using Voidwaikers approach which may lead to more promising results.

Ok. This is your problem, its not a problem with it being about mods. It is a problem with those methods not existing, they have different names now.

Then you should be able to solve the errors you have. They are errors in method signatures.

Learn that first, modding is incredibly difficult if you don't.

Do you know the basics of Java?

If it is disabled remove any recipes from it after they have been added via whatever condition you want, and do the same for removing it from a creative tab.

They don't all TE's are ticked at the same time from the world being ticked. Generate a random number and determine if the update method is called from that?

Yes, don't do that.

No, Minecraft is really weird about what it uses deprecation for. When they use it for blocks it means don't call it.

Use your IDE to find the correct parameters Block#isOpaqueCube exists in 1.12 and it has an IBlockState parameter.