I've found it helps to watch 'state of x in 2020' type videos to get a broad overview, and weekly email newsletters can help stay on top of a particular area.

I've found it helps to watch 'state of x in 2020' type videos to get a broad overview, and weekly email newsletters can help stay on top of a particular area. Apart from that the skill is in knowing what you need to know about something. For example I don't need to know the details of the latest .NET syntax to know that .NET Core runs on Linux, which was a pretty big shift in that world. But to a certain extent there's no alternative to putting in the hours. Reading different sources, practice, repetition, flash-card software are the keys for me.