Dual Boot Ubuntu and Windows

Prerequisites

You need Windows 11 or Windows 10 running on your PC or laptop.
You need an 8GB or higher pen drive to create a bootable disk with Ubuntu Linux.
You need to reserve a free space of 50GB or higher from your drive.

This method is only for computers running in UEFI BIOS mode. For checking whether your computer is running in UEFI mode or not, Open Run( win + R ) then check the BIOS mode.
If the above is true for your system then you are all set to go.

STEP 1 - Downloading the required files

Go to ubuntu.com and download the Ubuntu 22.04.2 LTS . The latest LTS version of Ubuntu, for desktop PCs and laptops. LTS stands for long-term support — which means five years of free security and maintenance updates, guaranteed.
Now Download the latest version of Rufus to create a bootable USB drive easily. Once both Ubuntu and Rufus are downloaded then place them somewhere in the computer for easier navigation.

STEP 2 - Creating a free space for Ubuntu

Go to Control Panel and Open the Disk Management or Creating Disk Partition and Management. You can also find it by searching discmgmt.msc in the search bar.
Now Create the Disk Partition in a drive (D:) depending upon the space you want to allocate to Ubuntu. Right-click on the partition and select the Shrink Volume option and create the unallocated space required for Ubuntu.

STEP 3 - Creating bootable drive with Rufus

Now connect the pen drive to your PC / laptop. Right-click on the Rufus folder and select Run as an administrator. For the updates popup select yes. Then this page will be opened.

Here, leave the device section as default. In boot selection select the Ubuntu iso image file from your computer(the place where you saved it earlier). Select the partition scheme as GPT. Target System as UEFI. After all this press Start then select Write in ISO image mode (Recommended).

Wait till the process is completed(depends on the writing speed of your pen drive). After completion close it.

STEP 4 - Installing Ubuntu

Restart the Computer and Enter into the BIOS of the computer, and check for the following things:-

Intel Rapid Storage Technology is disabled. (you can reenable it if you want it in future)
USB Boot is enabled.

Now Save the changes and again while restarting press ESC or F2 or F10 or F12 on your keyboard to launch the boot menu depending upon your computer. Now choose the pen drive you have inserted to boot into Ubuntu live setup.

To enter into BIOS refer to this article.
After successful booting this page will appear

Click on Ubuntu and boot into the live setup.

This will be the first page of Ubuntu.

Click on Install Ubuntu. Select your language.

Keyboard layout
Updates and Other Software

Check out both the options given under other options, then click on continue.

Installation Type

CAUTION :- Select Something else option on the page, and we will create partitions for root home and swap by ourselves. Do not touch any of the partitions after clicking on the Something else option as it will destroy the Windows data.

Look for the free space and click on it, and then click on the + sign to make the partition

There will be three partitions created that are - root home and swap

ROOT

Root directory or folder in any operating system is the one containing all the folders, data, files, directories, and subdirectories. In the Linux operating system, everything that needs to support a system is stored in the root directory.

HOME

In Ubuntu (and other linuxes), your 'home' folder (generally know as $HOME ) exists at the path /home/<your-username>/ , and will, by default, contain a collection of folders, including one called Public. If you open the file manager at $HOME , then it will open in this folder.

SWAP

Swap space is used when your operating system decides that it needs physical memory for active processes and the amount of available (unused) physical memory is insufficient. When this happens, inactive pages from the physical memory are then moved into the swap space, freeing up that physical memory for other uses.

Creating root partition.
Creating home partition.
Creating Swap partition
After all this click on the Install Now option and press continue on the screen coming after it.
Choose your timezone and create a user account

Now sit back and relax, installing will take 5 to 20 minutes depending upon the writing speed of your drives. After the installation is completed, select the Restart Now option.