Hi there.
I’d love to model something like this, but there aren’t any tutorials, so how would you do this? I’m using Blender 5.0 myself. Preferably array modifier, but Geometry nodes fine by me.
Welcome 
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the internet is full of tutorials when searching for: “3D leafs on a tree”… you might also try bush or add tutorial… and espcailly on a “well known video platform”…
Even when originally for other apps this can help too…
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Okay here’s another quick one… 
I agree with @Okidoki don’t worry if you find tutorials that are in other applications because the knowledge and skills are transferable. Generally you use alpha cards for leaves and most of the work is in the texturing. Try to make your mesh as efficient as possible by roughly following the shape of the leaves but don’t overdo it with the geometry. There’s a balance between the poly count and transparent parts of the texture. When dealing with transparency you get something called overdraw which is basically the GPU having to rewrite the same pixels over and over again to blend transparent object which can take a big performance hit. If you are making this for a game it is critical for getting the overdraw down as much as possible but even if it’s not for a game you will still benefit from optimising for better render times.