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Why is the assets folder at the repository root ? And why is it named 'textures' ? Can you confirm that your assets are located at src/main/resources/assets/[modid] ? If not, it won't work.

This is in the Support & Bug Reports section, which is for mod users rather than mod developers. Issues with a specific mod are best reported directly to the author, though.

When you view a Vanilla or Forge class, does a yellow bar appear at the top of the editor saying "Decompiled .class file, bytecode version X.X (Java X)"? If so, click on the "Choose sources..." link and the Attach Sources window should appear with the directory containing the Forge JAR opened. Select the forgeSrc-<version>-sources.jar (the JAR containing the source code for Minecraft and Forge) in this directory and then click OK. The name of the method is irrelevant, what matters is the parameter type. When you create a method annotated with @SubscribeEvent that has a single parameter that extends from net.minecraftforge.fml.common.eventhandler.Event and register the class/instance with the appropriate event bus (e.g. by annotating the class with @Mod.EventBusSubscriber), Forge will automatically call the method whenever that event is fired. The documentation explains events properly here. RegistryEvent.Register<T> is fired once for each registry when that registry is ready to receive registrations. The type argument is the registry's type. Subscribe to RegistryEvent.Register<Block> to register your Blocks, subscribe to RegistryEvent.Register<Item> to register your Items, etc. Registering in preInit is the old way to do things, the registry events were introduced so modders can register their registry entries (Blocks, Items, etc.) at the correct point in the loading process without worrying about when that is. For example, RegistryEvent.Register is fired for most registries directly before preInit (in 1.10.2-1.11.2) or directly after preInit (1.12+); but in 1.12 it's fired for the recipe registry slightly later. Eventually, it's planned for recipes to be loaded at server start, so RegistryEvent.Register<IRecipe> will be fired then instead of between preInit and init.