Depending on his age, interest in "gadgets", and interest in photography- Lots of choices for $800. Nature photography- meaning photographing birds and animals at a distance, or scenery? Birds at a distance means using a higher power lens, usually a zoom these days. Insects- a lens with "Macro" mode. $800 buys a Nikon Coolpix P950 with a zoom of over 80:1, telephoto to wide-angle.
The Nikon COOLPIX P950 digital camera features 16.0 megapixels resolution and a super-telephoto 83X optical zoom/166X Dynamic Fine Zoom lens for photographing everything from nature landscapes to portraits, wildlife and more!
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The Zoom is built into the camera, cannot be changed. The one camera will "do it all".
Other options include cameras with interchangeable lenses. This can get very expensive, very fast.
As an example, a Nikon Z series Mirrorless camera with a 3:1 zoom is $900,
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The "Image sensor" is much bigger than on the "Coolpix". More glass, more expensive.
For the "Super-Zooms", there are many lower cost cameras that have a lot of capability.
At under $400, has an electronic viewfinder- consider very important for holding the camera steady.