Just as the internet itself is too big and various to define in any way beyond the sketchiest outline, writing for it is likewise too diffuse to nail down entirely. What you do and how you do it will depend entirely on the context you work in—as a hobbyist, a professional, or a freelancer, as a marketer, journalist, or technical writer.
The way we use the internet evolves every single time when we find new ways to implement it, now with AI being the latest trend it will be interesting to see how it will be used down the road.