General Usage - NellsRelo/Multitool-Wiki GitHub Wiki
General Useage
With the Multitool installed and configured, our Window should look like this:

At this point, let's get into understanding the features of the Multitool.
Unpacking .pak Files
This is the core feature of the Multitool. It allows you to unpack the game files, and explore how Larian brought Baldur's Gate 3 to life. You'll have plenty of examples on how to create certain aspects of your mod.
Decompression
When the Multitool has finished Unpacking the game files, there are still files that can't be worked with directly, with extensions like .lsf, .lsb, or .loca. Fortunately, the Multitool can decompress these files into editable .lsx and .xml files.
Index and Searching Files
The Multitool provides a handy file search function for its unpacked files, which requires indexing the Unpacked Files to be effective.
GameObject Explorer
The GameObject Explorer, or GOE for short, is a useful tool that allows for quickly searching through Game Objects and their properties, as well as viewing thier models. It serves a different purpose than the index search, and both are valuable tools for any modder.
Packaging/Unpackaging Mod Files
One of the more common tasks modders will use the Multitool for is packaging their mods, or unpacking .pak files from other mods. Both of these functions work similarly to each other.
UUID/Handle Generation
If you're creating new Spells, Actions, Statuses, Passives, Races, or Classes, chances are, you're going to need to generate a ton of UUIDs and Localization Handles. Multitool makes this extremely easy, by having a built-in generator in the main window.
Additional Information on Using the Multitool
Padme4000 has created a mini-tutorial on how to use this tool.