If you're looking to darkify the web, I can recommend "Dark Reader" if you use Chrome or derivatives. https://chrome.google.com/webstore/detail/dark-reader/eimadpbcbfnmbkopoojfekhnkhdbieeh

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Blockchain technology. Whether Bitcoin turns out to be a bubble or not, the underlying blockchain technology is still going to revolutionize many industry sectors.

Thanks Daniel, these are all good examples to learn about blockchains. However, I was thinking more in terms of open source projects where developers can create their own chains as part of the learning process. One that I have found is https://www.multichain.com/. There are also some Javascript projects around too. It might be an interesting project, to create a basic blockchain platform based on {insert programming language of choice}.

As a developer, knowing about Bitcoin may not be required, but learning about Blockchains (the technology on which Bitcoin is built) will stand you in good stead. Search for blockchain tutorial or blockchain online demo for some good resources.

There's and excellent tutorial / hands-on demo here: https://blockchaindemo.io/ It may still be too simplistic for your requirements but I found that it helped me get my head around the basics.

The value of my BTC has increased significantly in fiat terms, but I'm of the opinion that cashing it in right now wouldn't be wise. The potential for further growth is too compelling. Cash out now and run the risk that the price will surge and you'll never be able to buy at this level again. So, for now, I'm a HODLer.

Coda II for larger projects, Visual Studio Code for smaller stuff.