Hello @lienminh247 ,
Thanks for the comment. Glad you liked the post. I used to include the image source separately but found out when you get photos or images from sites like https://www.pexels.com and https://pixabay.com/
As long as you do not change the image name it sources automatically by the image name.
So site crawlers like Google and Cheetah see it and register it accordingly.
ie first pic address shows up as:
active-beautiful-beauty-866027.jpg
google image search brings up:
https://www.pexels.com/collections/working-out-txnljhq/
I find it so much better to use images from these sites that cover free use for individual and professional use than just pulling images off the web. It prevents big headaches and potential legal issues.