Ugdhar

Those are warnings, not errors, and won't stop your game from starting, there is something else wrong. Read the FAQ, and post full logs please.

I don't have a 1.16.5 workspace, but in the workspace I'm looking at the Mob class has a method called populateDefaultEquipmentSlots that you could try to override and add your pumpkin head there.

The problem with tutorials and documentation, is that the minecraft code changes constantly, so documentation, outside of the very basics, becomes outdated. Using your example of a list of forge's events, you would use your IDE to browse the minecraftforge classes, specifically net.minecraftforge.event where you will find event classes, as well as other packages further refining the events available, such as events for entities, enchanting, brewing, etc. A lot of things can be accomplished by "seeing how vanilla does it" as well. And of course, when new versions come out, there's a chances anything and everything will break, and have to be recoded with whatever new way things are being done.

Please post logs from your specific issue (as directed in the FAQ https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/) instead of posting on someone elses thread, it will likely get you help faster, as well as identify your specific issue.

Please do not piggyback on other threads. Please read the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/) and post logs as described there, linking to them here, and someone may be able to help.

Please post the complete log, it will show more information that could help determine the problem.

Please read the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq), and post logs as described. Posting your code (a github repository is preferred) is also useful for getting help debugging.

Please post logs as described in the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/) and post logs as described there. I have split your reply to the other topic into a new post. It is best to not post in a year+ old topic for an issue, especially when that old topic is marked as solved.

Please start a new topic instead of piggybacking a years old topic that may or may not be related to your issue. Explain what is going wrong with your game, and then post logs as described in the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq).

These are the Minecraft Forge forums, Neoforge is not supported here. You would be best served seeking support on their website and/or discord.

For sharing code, I would suggest putting your mod on github, it would allow someone to build/run your mod to help test, as well as peruse the code. I would at the very least share the code for your new material/tool tier, my first thought would be that it is related to the enchantability level of the material.

Please read the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/), and post a description of your issue, along with logs posted to a site such as https://mclo.gs and post the link here. Please do not try to piggyback on years old topics that may or may not be your actual issue.

Please read the FAQ and post logs as described there. Even problems that look the same are not always the same, and logs are needed to discover what is going wrong.

Please read the FAQ (https://forums.minecraftforge.net/topic/125488-rules-and-frequently-asked-questions-faq/), and post logs as instructed there, to an external site, and share the links to them here.

These are the Minecraft Forge forums, Neoforge is not support here. You would best be served seeking support on (I believe) the Neoforge discord.