Recently i started developing an addon, and I'm learning blockbench, so far with modeling and animating I've had no issues, but when i add any particle effect or sound to my animations, they don't show in game. I'm pretty sure I'm missing something in the code or the files, but i have no idea what is it, and I've been looking for guides but I've found little to no info that helps me. ¿How do i make sound effects and particle effects work in game?
Pretty sure these should help you. It's a known website for developing resource packs and behavior packs. Usually contains behavior pack information, but it also contains resource pack information too. Particles and sound effects are located in resource packs.
(You can also find related pages in the Documentations tab in the wiki site, being "Sound Definitions" and "Particles". Those pages list all the particles and sounds found in Minecraft. Those may be useful but I have not listed them because I think these pages cannot fix your issue.)