How to have an image for back ground

Question

And something more! Can you give me link of cool background's

Answer 1

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https://www.sololearn.com/discuss/1316935/?ref=app

https://www.sololearn.com/Discuss/1611754/?ref=app

And for some background or photos you can refer to :
Pexels:- https://www.pexels.com/

Unsplash:- https://unsplash.com/