Here is a list of all files with brief descriptions:

acpi.h
ahci.h
apic.h
arp.h
ata.h
basic.h	Retro Rocket BASIC interpreter
basic_tokenizer.h
clock.h
debugger.h
devfs.h
devicename.h
dhcp.h
dns.h
drawing.h
e1000.h
errorhandler.h
ethernet.h
fat32.h
filesystem.h
fpu.h
hashmap.h
homer.h
icmp.h
idt.h
initialisation-functions.h
input.h
interrupt.h
io.h
ioapic.h
ip.h
iso9660.h
kernel.h
keyboard.h
kmalloc.h
lapic_timer.h
limine-requests.h
maths.h
memcpy.h
net.h
partition.h
pci.h
printf.h
ramdisk.h
random.h
rr-cpuid.h
rtl8139.h
spinlock.h
string.h
taskswitch.h	Handles processes and multitasking
tcp.h
timer.h
udp.h
video.h