Forge Mod Skeleton

ForgeModSkeleton.java

@Mod(YourMod.MODID) // tells forge to construct this during modloading
public class YourMod
{
  public static final String MODID = "yourmod";  // use this same string everywhere you need a modid
  
  // Deferred Registers are forge's latest abstraction layer over the registries
  // you give them suppliers and they create and register your things when the registry event happens
  // don't forget to subscribe them to the mod bus in your mod constructor! this is important for making them work
  // in 1.14 or old forge builds of 1.15 use `new DeferredRegister` instead of .create
  private static final DeferredRegister<Block> BLOCKS = DeferredRegister.create(ForgeRegistries.BLOCKS, YourMod.MODID);
  
  // registry objects let you static-init a reference to the block without actually creating the block right away
  // the deferred register will create and register the block during the block registry event and then store your block here
  public static final RegistryObject<YourBlock> YOUR_BLOCK = BLOCKS.register("yourblock",
    () -> new YourBlock(AbstractBlock.Properties.from(Blocks.SPONGE))); // re-use existing block properties or create your own,
    // see Blocks for examples of block instantiation

  public YourMod() // invoked by forge due to @Mod
  {
    // mod bus has modloading init events and registry events
    IEventBus modBus = FMLJavaModLoadingContext.get().getModEventBus();
    // forge bus is for server starting events and in-game events
    IEventBus forgeBus = MinecraftForge.EVENT_BUS;

    // add listeners to mod bus and forge bus, register deferred registers to mod bus
    BLOCKS.register(modBus);

    // add listeners to clientjar events separately
    if (FMLEnvironment.dist == Dist.CLIENT)
    {
      ClientEvents.subscribeClientEvents(modBus, forgeBus);
    }
  }
}

// separate class in a different file
public class ClientEvents
{
  public static void subscribeClientEvents(IEventBus modBus, IEventBus forgeBus)
  {
    // subscribe client-only events
    // client-only classes like Minecraft can be safely referred to in this class
    modBus.addListener(ClientEvents::onClientSetup);
  }
  
  public static void onClientSetup(FMLClientSetupEvent event)
  {
    // renderers can be registered here
    // register an entity renderer
    RenderingRegistry.registerEntityRenderingHandler(your entity type, renderer factory);
    // register a tile entity renderer
    ClientRegistry.bindTileEntityRenderer(your tile entity type, YourTileEntityRenderer::new);
    // set block render layer to cutout or translucent if block doesn't use a solid texture
    RenderTypeLookup.setRenderLayer(your block, RenderType.getCutout());
    // register Screen factory for synced container guis
    Screenmanager.registerFactory(your container type, screen factory);
  }
}