When you search for images on Google follow these steps:
Open a new search window - Google.com
Type the subject: chickens
Wait for results to pop up
Then Click on Images at the top (if you hadn't already)
Then BEFORE clicking on any pictures, click Tools at the top
Then Click on Usage Rights at the top
Then click on Creative Commons Licenses
This should remove most (but not all) pictures that might be copyrighted
Keep in mind though that Fair Use says you can use most pictures except trademarked/copyrighted (McDonalds) unless you get permission first or you have an attribution (the website the picture came from) for EACH picture. Also as long as you are not trying to sell the image or misrepresent the image as belonging to you, or that you created the image you can use some pictures.
Also, if you search for a picture inside Google Slides using Insert then Search the web those images are mostly not copyrighted depending upon what you typed (McDonalds) etc.
Chromebook picture capturing follow the steps above for a wide open internet search..
Click on the individual picture then right click and click on Open Image In New Tab
Click on the new tab, click on the picture then Right Click and scroll to Save Image As
Name it something easy to remember
If a separate window pops up saying it is saved to the Clipboard you did it correctly!