"Search by Image" is a Firefox extension; don't know if it's available on other browsers. With one click, you can search Google Images, Bing, Yandex, Baidu, Getty, iStock, Shutterstock, Pinterest, Adobe Stock and about 8 or so more. You can specify which one(s) you want and results come up (or not) in every engine.
You can also search images by using Google. On the main Google search page, click on "Images" at the top right of the screen. Then click on the camera icon in the search bar (it says "Search by image" if you hover your cursor over it). Once that box is open, just drag and drop the picture you want to search anywhere into that box and it will search it for you. Hope this makes sense. Good luck!