Simple steps to Install Android
ADB and Fastboot (with drivers) on
Windows.
What is Adb and Fastboot???
ADB :Android Debug Bridge
This works when the device is
powered on and booted into OS or
Recovery. The tool helps in sending
basic Linux commands, and a variety
Android-specific commands from PC to
connected Android devices.
Fastboot:
Fastboot mode allows you to flash any
partition on an Android device like
system, boot, recovery, cache..
etc.Using Fastboot / bootloader, you
can also flash the custom built .img
files via fastboot. For example, a
custom recovery like TWRP or CWM.

#[Guide] How to Install Android ADB and Fastboot

#Downloads

Download 15 seconds ADB Installer
1.4.2-HERE
If the above version doesn’t work well,
try ADB installer v1.3-HERE
1.First Download the adb-setup-1.4.2.exe file from the download link above.
2. Double-click/Run the adb-setup-1.4.2.exe file.
3. You will see a command prompt window with blue background.
Say YES to all the prompts on this
screen.
→To say YES, just type Y and hit
enter.
Once ADB, Fastboot and Drivers are installed, the setup window will automatically close and you’ll have a working ADB and Fastboot on your Windows.
Credit- XDA member Snoop05