Concurrency and channels in a web app

I recently picked up go and to learn it started building a website because that what I do in my real job.

Now my question would be, what could I implement in my website that would allow me to learn concurrency goroutines and channels? A chat is boring and i’ve done it many times in other languages so I am open to suggestions

Just try to think of expensive computations that can be solved concurrently. Building a web scraper/crawler helped me in the beginning. Maybe a tool that does batch operations on images, e.g. an image resizer.

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