hie Riaan97vdr you may find some of the sites to get free images from below sites;

http://freeimages.siterubix.com/ http://bestanimations.com/Books/Writing.html
Completely free photo sites
Where to access a Free Image Library of thousands of images
Free Images for a Website - Free to Use, No Attribution
How to Find Free Images on Google - The Correct Way
Setting A Chrome Browser To Show Free Images
How to find free images
Making Use of Visuals
Free Images for Websites - Use Without Any Restrictions
25 Sites with Royalty Free Images For Commercial Use CC0 License
Free Images For WA Members
Free Images, Photos, Cliparts, Editors, Gifs, Graphics
For Newbies: Free Header Logos and Free Images
Free logos, images and image editors online
57 Free Photos Sites for Your Website
I know some are duplicates but you will see there are many choices for you to explore.

https://www.bing.com/images
https://quotescover.com/
http://www.simpleimageresizer.com
https://www.awesomescreenshot.com/
http://www.picresize.com/
http://profilepicturemaker.com/photo-editor/
http://quozio.com/
http://www.picture2life.com
https://www.photocollage.com/
https://photos.google.com/

The best places to get images to freely use without any problem are
https://pixabay.com
https://pexels.com
https://unsplash.com/
https://morguefile.com

or you can pay a small amount on places like

https://depositphotos.com/
https://www.istockphoto.com
https://shutterstock.com

Here is a very useful link with tools you cannot ignore, https://workathomefuture.com/cool-amazing-free-website-tools
Why You Need To Compress Images For Your Website
https://tinyjpg.com/
Speed Tools you can use (free)
WebPageTest: The industry standard for measuring site performance – results are collected from real browsers running common operating systems.
Pingdom: a simple tool which makes makes the same measurements, yet method of testing is undocumented.
GTmetrix: gives you actionable insights about the best way to optimize your webpage speed.
One step you can take to improve your site speed is to compress your images before upload them to your side.
http://compressimage.toolur.com (Online photo resizer and image optimizer).

http://www.imageresizer.net/

https://reverse.photos/

https://www.tineye.com/

https://images.google.com/

images.google.com/

https://smallseotools.com/reverse-image-search/

FREE IMAGE SITES:
Top Free images Sites with many free images:
https://pixabay.com/
https://unsplash.com/
https://stocksnap.io/
http://kaboompics.com/
Images for Startup and tech related Business:
http://startupstockphotos.com/
Food related Pictures:
https://www.foodiesfeed.com/
Project work related pictures:
http://isorepublic.com/
Images for Creative related Projects:
http://publicdomainarchive.com...
Many Free Image websites link and lifestyle images are available here:
http://furiouscamera.com/
Stunning landscape and nature photography:
http://cupcake.nilssonlee.se/
Landscape Photography:
http://jaymantri.com/
Free nature images:
http://freenaturestock.com/
Images for nature and city photos:
https://mmtstock.com/

General category Other free image sites:
http://realisticshots.com/
http://www.lifeofpix.com/
(Images are categorized on this website in a gallery)
https://www.gratisography.com/
http://snapwiresnaps.tumblr.co...
(Hand-picked images of talented photographers)

https://smallseotools.com/

In site content there is a button called images. There are thousands of free images you can use.
You could also use sites like pixabay pexels unsplash etc.

WA provide free-to-use images. But if you want to search more, I have written a blog post about it some time ago. Hope that helps. 57 Free Photos Sites for Your Website Joe

Hello
You can find images for your posts within WA.
When you are creating content for your site, simply click the add image button, a box will pop up. You will see where you may upload an image, but also search an image. There are plenty of images to choose from.
Good luck and if I can be of more help please feel free to message me.