Note: You will find this works on the majority of windows based laptops so read on to TAKE A SCREEN SHOT WITH WINDOWS.
The snipping tool is a tool that allows you to draw around an area of the screen. That area then is saved as an image to send or use as you wish.
Use the Snipping Tool. This is the preferred method. The snipping tool is available from windows 7 and upwards you can assume you have it.
It can be fun to play and experiment with the 4 forms but mostly you might like the rectangular snip as this goes around 'windows' naturally and is neater and faster.
Before the snipping tool was available windows users would usually use the print screen key and then paste (Ctrl+v) into the paint program. This was very clunky and made me cringe at how clunky this was given it is such an essential function. It's major downside apart from how clunky it is is that you get the whole screen.
Use the Print Screen Key to capture the whole screen (even with dual monitors) and the paste (ctrl + v) this into a programme like paint. You can then edit the screenshot or save and attach in an email.
There are some really good apps that have plugged the gaps and work even nicer than the snip tool. Some have free options like SKITCH and Markup Hero and work very well. They offer the ability to hold the screenshot on a webpage and then a link allows the user to view that. Privacy is more of a concern but for some cases the screen is uninteresting and these tools like skitch allow things like blurring out detail and annotations. I use it a lot. Another option is Lightshot.
If you need to capture an open menu you need to master using Control (Ctrl) and PrtScn which will capture the whole screen and then you can use this with the snip tool.
More detailed information on the snipping tool can be found here
Also worth mentioning that to be careful with sending your screen to people or sharing such captures. You might be showing them some information that is private such as spreadsheetssheets with private data. So consider this and therefore use some way to paint out the private data.
if you are unable to take the screenshot then Printscreen also works. You can find a key on the top left of the keyboard on your Lenovo laptop. Take the Printscreen and paste it on Paints or MS Word.