Here is a list of all topics with brief descriptions:

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LLVM-C: C interface to LLVM	This module exposes parts of the LLVM library as a C API
Analysis
Bit Reader
Bit Writer
Transforms
Core	This modules provide an interface to libLLVMCore, which implements the LLVM intermediate representation as well as other related types and utilities
Comdats
Types and Enumerations
Contexts	Contexts are execution states for the core LLVM IR system
Modules	Modules represent the top-level structure in an LLVM program
Types	Types represent the type of a value
Integer Types	Functions in this section operate on integer types
Floating Point Types
Function Types
Structure Types	These functions relate to LLVMTypeRef instances
Sequential Types	Sequential types represents "arrays" of types
Other Types
Values	The bulk of LLVM's object model consists of values, which comprise a very rich type hierarchy
General APIs	Functions in this section work on all LLVMValueRef instances, regardless of their sub-type
Usage	This module defines functions that allow you to inspect the uses of a LLVMValueRef
User value	Function in this group pertain to LLVMValueRef instances that descent from llvm::User
Constants	This section contains APIs for interacting with LLVMValueRef that correspond to llvm::Constant instances
Scalar constants	Functions in this group model LLVMValueRef instances that correspond to constants referring to scalar types
Composite Constants	Functions in this group operate on composite constants
Constant Expressions	Functions in this group correspond to APIs on llvm::ConstantExpr
Global Values	This group contains functions that operate on global values
Values with alignment	Functions in this group only apply to values with alignment, i.e
Global Variables	This group contains functions that operate on global variable values
Global Aliases	This group contains function that operate on global alias values
Function values	Functions in this group operate on LLVMValueRef instances that correspond to llvm::Function instances
Function Parameters	Functions in this group relate to arguments/parameters on functions
IFuncs	Functions in this group relate to indirect functions
Metadata
Operand Bundles	Functions in this group operate on LLVMOperandBundleRef instances that correspond to llvm::OperandBundleDef instances
Basic Block	A basic block represents a single entry single exit section of code
Instructions	Functions in this group relate to the inspection and manipulation of individual instructions
Call Sites and Invocations	Functions in this group apply to instructions that refer to call sites and invocations
Terminators	Functions in this group only apply to instructions for which LLVMIsATerminatorInst returns true
Allocas	Functions in this group only apply to instructions that map to llvm::AllocaInst instances
GEPs	Functions in this group only apply to instructions that map to llvm::GetElementPtrInst instances
PHI Nodes	Functions in this group only apply to instructions that map to llvm::PHINode instances
ExtractValue
InsertValue	Functions in this group only apply to instructions that map to llvm::ExtractValue and llvm::InsertValue instances
Pass Managers
Debug Information	This file declares the C API endpoints for generating DWARF Debug Info
IR Reader
Linker
New Pass Manager
Instruction Builders	An instruction builder represents a point within a basic block and is the exclusive means of building instructions using the C interface
Module Providers
Memory Buffers
Pass Managers
Threading	Handle the structures needed to make LLVM safe for multithreading
Disassembler
Error Handling
Execution Engine
LLJIT
LLJIT Utilities
On-Request-Compilation
ExecutionEngine-based ORC Utils
LTO
ThinLTO	// endgoup LLVMCLTO
ThinLTO Cache Control	// endgoup LLVMCTLTO
Object file reading and writing
Remarks
Target information
Types and Enumerations
query interface.	Retrieve the Function with VFShape `Shape`
Dwarf constants dumping functions	All these functions map their argument's value back to the corresponding enumerator name or return an empty StringRef if the value isn't known
Dwarf constants parsing functions	These functions map their strings back to the corresponding enumeration value or return 0 if there is none, except for these exceptions:
Dwarf version for constants	For constants defined by DWARF, returns the DWARF version when the constant was first defined
Dwarf "vendor" for constants	These functions return an identifier describing "who" defined the constant, either the DWARF standard itself or the vendor who defined the extension
Find DIEs corresponding to Address map entries.	Recursively walk the `DIE` tree and look for DIEs to keep
used to link the debug information	Emit unit's abbreviations
table emission
MC layer objects constructed by the streamer
setters
controlling options	These entry points control the ThinLTO cache
of APIs to run individual stages in isolation.
Predicates to tune DWARF for a given debugger.	Returns whether we are "tuning" for a given debugger
of functions returning DIE info.
methods to access OrigUnit.
Members accessed asinchronously.	Data global for the whole linking process
CMP;CCMP matching	These functions deal with the formation of CMP;CCMP;... sequences
Utility declarations/definitions specific to ARC.
ARC Optimization.