A:AnswerNo you should only need one. Here is the users guide.
http://h10032.www1.hp.com/ctg/Manual/c05704040
If you are unable to get your new monitor to work with the manual, contact HP support at https://support.hp.com or 1 800 HP INVENT>
A:AnswerUsually you will need a USB-C to HDMI adapter, because it's a USB-C that will deliver monitor signal, not standard USB-A. What other ports does your laptop have? We can't really answer without knowing the actual model and its specs.
A:AnswerThe 2nd monitor image for the 23.8 inch monitor on Page 3 of the user guide for the HP 24yh monitor gives you the visual of the back of the monitor. Here is the user guide: http://h10032.www1.hp.com/ctg/Manual/c05704040
A:AnswerOn the back of the monitor, you'll notice an area that runs across the back in the center that's thicker than the rest of the monitor. The video input ports are on the very bottom of that. If you feel the bottom of that area on the monitor, you'll find them.
A:AnswerYou may want to use a docking station to connect to your laptop. Just be sure you have the right ports to match the monitor, keyboard and mouse.