All images used by the BlueOne template are licensed for free personal and commercial use. If you'd like to use any specific image, you can check the licenses and download the images for free on Unsplash.
The font family used by BlueOne is Roboto, an open-source font from Google. You can download and view the font license on this page.
The illustrations used by BlueOne are from Undraw. You can download and view the font license on this page.