unsplash.com is a fantastic resource for free photography, but you must make sure you credit the artists, it’s the least you can do.
Phone Image: Elena Koycheva on Unsplash
Space by Greg Rakozy on Unsplash
Laptop by ThisisEngineering RAEng on Unsplash
Print Blocks by Amador Loureiro on Unsplash
Code by Maik Jonietz on Unsplash