@rbfloyd
OK, so you wish to install alongside in a multi boot installation, on your 2017/8 dell Laptop
Things to do..
W10/11 disable windows quick-start and secure boot in the UEFI/BIOS and re-boot
Be aware Rufus has not been behaving itself with Linux, Balena Etcher seems to be preferred,
If you do not wish to manually partition the drive Ubuntu install can do it for you ,make sure you select install alongside windows option [wording may differ]
when you install Linux, it will automatically become the first boot option on the grub screen when you switch on,
your other options if you want to learn Linux before fully committing to it, is to install it to a virtual machine inside windows using Virtual box or WSL [Windows subsystem for Linux]
If you go for the full installation, Dell are probably one of the easiest to install Linux on, the only foreseeable problem may be the Wi-Fi, depending on which card is fitted.