There's a number different additional resources out there, that will help you during creating your add-ons. They won't be necessary or used during this guide, but a list is always handy.
bedrock.dev - all documentations in one place.
The Guide's files - include all files showcased in this guide;
Techichal Bedrock wiki.bedrock.dev - includes more useful knowledge and tools, is sometimes referenced in this guide.
Bedrock Scripting Discord - here you can find assistance with your own add-on projects
The official minecraft.net Add-on page - you can download Example Vanilla packs from here.
UUID Generator - for manifests.
Bridge - a visual tool for creation of add-ons.
Custom Structure generator - a visual tool for creating custom generated structures
Particle Generator - a visual online tool by the maker of Blockbench;
MCPEDL - the place to publish your add-ons.
This guide has been created and is maintained by KaiFireborn. You can contact him via discord here for any questions, suggestions, or contributions.
Thanks to the Guide's contributors: Kreatik Studios, ckhrysze.