It depends on the laptop, and more specifically, whether or not the video chip used is able to support more than two displays. Odds are it won't, even in high end gaming laptops, you only have two RAMDACs meaning two displays no matter how many different output ports there are.
The way around this would be to get a USB "video card" which will work well enough for basic desktop use, but don't expect it to function well for even things like watching videos on youtube.
I know how to connect just an extra monitor with a VGA cable and use the extend the desktop feature so that I have screens
I know how to connect my laptop to a TV with an HDMI cord as well.
What I need help with is how to do them both at once so that I can have three windows open at once on my laptop. Is this possible and if so how do i do it?