It's pretty easy. If you have created partitions for all your disk space you should shrink a volume to get hard disk space for linux installation.
goto windows partition manager. ( click on search next to start in win 10 and type partiotion manager ) You will see all your disks and partition volumes created
right-click on the partition which you need to shrink and click shrink volume.
go through the process to create an empty space.
reboot with a bootable dvd or usb of linux.
boot into the linux distro and install as usual.
you will be asked to install grub ( don't skip it ).
after installation reboot
now you will see that linux and windows are listed in the bootloader ( grub menu).
It's pretty easy. If you have created partitions for all your disk space you should shrink a volume to get hard disk space for linux installation.
now you will see that linux and windows are listed in the bootloader ( grub menu).