2- In search bar at bottom "start search" type "Snipping Tool".
3- Click on New when Snipping Tool open. Here you have 4 different options.
i) Free-form Snip: You can select any portion of screen.
ii) Rectangular Snip: Select any Rectangular area of window.
iii) Window snip: Click on any window like paint or messenger it will automatically snip that window for you.
iv) Full Screen snip: Click any where on windows and it will snip Full screen for you.
p.s. After sniping you can directly press ctrl+v in Office to paste it.