Because personal computers come in all shapes and sizes, the Start menu, which takes up roughly the same amount of screen real-estate regardless of size, can be extremely useful.
You can put Cortana on the lock screen for comfort, but doing so could put your Windows 10 device at risk if you leave it unattended in a public place – a passerby could use the digital assistant to peek at your messages or something similar.
Do you want to avoid using the lock screen to log in? There is a simple way to do this: first, open the Run command box. To do so, simply type the following into the Cortana/search box (next to the Start menu):
The lock screen on Windows 10 can be a pain to deal with, particularly if you don't have a touchscreen to swipe it away. Windows Hello makes things a little easier, but only if you have a computer that can run the authentication system and has the necessary hardware.