In terms of resources, maybe there are existing repositories on GitHub for Eaglercraft hacks. But again, the user is looking for guidance rather than a direct link. Alternatively, they might need to download a .js file and inject it via a browser extension.
Moreover, since Eaglercraft is a single-player browser game often hosted on websites, the user might be hosting it themselves, in which case they can freely modify the files. If they're playing on a server, they might need to look into client mods instead of browser-based hacks.
Alternatively, there are online cheat websites that provide keybinds or scripts for Eaglercraft. But again, trust is an issue here. The user should be warned to be cautious about any online tools that ask to download files or require enabling a malicious extension.