Im a newb, trying to put together my first blog site ever, in a health and fitness niche. I have some articles typed out and my wordpress set up. I am having troubles finding free images to put in my content. I do not want to have to pay a dime for these images, so I am obviously only searching for creative commons-licensed images or the like. I want at least 1-2 images per blog article posted and I also want to have a page dedicated to "Motivational Media". This page, ideally, would be filled entirely of pictures, videos, GIFs etc to motivate my target audience for their fitness goals.
Is my only option to take my own pictures or pay for quality ones? What about youtube and vimeo videos, would I get in trouble with copyright infringement for embedding those? Also, what about images such as this one: https://twitter.com/FitMotivation4U/.../photo/1/large
-could I get in trouble for using those types of images too?
Thanks, and sorry for the very novice questions