What is Trending
Checkout what is trending, do not learn something doomed to be deprecated.
Annual developer survey. And compare the popularity on the trends page.
Updated every October (before the Nov/Dec holiday season) summarizing the trends this year.
Besides the annual summary, check https://github.com/trending for current tranding GitHub repos.
Updated every month, ranking 300+ databases.
Updated every month, ranking the programming languages.
Similar to TIOBE ranking but by analyzing how often language tutorials are searched on Google.
Compare the open source projects.