@Astra
Hopefully you can get into the UEFI Bios and maybe the setting is like this.
Restart and get into the BIOS, switch the SATA operation mode from RST to AHCI (press ctrl+s in the main BIOS tab in order the option to appear), save changes.
I’m pretty sure in bios screen press CTRL + S, when the MAIN tab is open.
Sir right now the main problem is that my laptop is not accessing the bios becz of dual os i have right now
Are you not able to delete the partition from Windows?
Sir i was able to delete the patition of linux of my harddrive but also while doing boot it is still there
Sir after a lot of problems i was able to delete the distro changed the sata mode from RAID to AHCI now lets see what happens 
Okay so now the drive is being seen and you should be able to select the proper drive from the drop down box and install what ever online, or community edition desktop you choose making the selections you want for file system and swap file and or other things. You can use erase disc and swap file and ext4 and select the drive you should have no issue now or other option.
Edit: I’m sorry there was a bit of confusion in the beginning as i didn’t understand there was another drive. Glad you were able to get it working now.
No worries sir
I was able to learn a lot from you becz of these problems and i m glad u taught somethings that was unknown to me .
Thanks for your precious time …
and if some problems get into me regarding linux in coming days i want you to guide me sir
Well i don’t know everything but i try my best. What desktop did you install?
Sir in Acer nitro 5
Yes but what desktop did you install of EndeavourOS. It looked like you had launched the Community editions install in the post above?
Sir if u r talking about desktop environment then i just installed gnome
I m new here that’s why I don’t know more
Okay so you installed Gnome desktop. That is a good choice. So have you installed any software? Or do you need to know how? What kind of things do you want to install?
Sir i want to ask you
Is there any way of making the best GUI with best customization
And which desktop environment is best for it
Yes sir please guide me I don’t know
So the package manager is pacman for most things. All packages that are in the AUR are packages that have to be installed with an AUR helper. yay is the AUR helper that is installed on EndeavourOS. You can use yay to also update as well as pacman. But pacman doesn’t work with AUR packages.
So to update open the terminal and type
sudo pacman -Syu
Then enter.
Sir i have already installed all the pacakges
Have you installed any software that you want to use?
Edit: I am talking about software such as the following as examples
vlc
libre-office
rhthmbox
gparted
What software sir can we explain it
Sir i installed libre office but don’t know what to do about it 
Sir i m front end developer so VsCode and other programming tools i need to download and i want to learn more commands of the linux