This is where all the magic happens, from endgame to starting. 
There is few things to consider now, there is a list of "tier", as the image.png shows to sort of
put everything in an order.
Does it means that you need to follow it on the dot. Not always, we are not in a GT pack

So here is a summary:
- server_scripts --> Has all recipes and logic that from custom interactions, like the altar effects
                     or the custom recipes

- startup_scripts --> Has the MA seeds script, and some liquid and items

- client_scripts --> Mainly some EMI and JEI integration and some lang file on lang/

- assets --> Has the most use. Here is a breakdown
    - catalyst --> Has quest images, and MMR lang file and a farmland
    - ftbquests --> Has the textures for some part of the quests and the "how to" file that couldnt pass to catalyst
    - kubejs --> For 2 liquids and 1 item
    - MMR --> Lang file for some name
    - Rest --> Textures for the custom gui colors

- data --> Has the altar functions and some ore stuff