You should always use copyright free images in your articles. Here’s how you can easily do it with Google when searching for images. https://images.google.com/
Type in your search term. Press the Tools button the right then press the Usage Rights dropdown menu and select “Creative Commons Licenses”. “A Creative Commons (CC) license is one of several public copyright licenses that enable the free distribution of an otherwise copyrighted work.
- Usage Rights -> Creative Commons licenses
For a quick way to snap and copy an image on Windows you can use the snipping tools. There’s a shortcut: Windows key Shift + S. Now it’s in your clipboard and can easily paste it.