You need to now what's availble, but focus on Front-end or Backend. Unless you use JavaScript, of course. In this case you can be more or less proficient in the client and server tech.
The best is to learn concepts and patterns. The rest are tools that come and go. If you know a programming language, you will figure our any framework or lib written with it. If you know what databases are, what are the core principles, how they work and what they are for (SQL, NoSQL, Graph), you will figure out MySQL, PostgresQL, Mongo, etc.
With this knowledge you will be always uptodate.
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You need to now what's availble, but focus on Front-end or Backend. Unless you use JavaScript, of course. In this case you can be more or less proficient in the client and server tech.
The best is to learn concepts and patterns. The rest are tools that come and go. If you know a programming language, you will figure our any framework or lib written with it. If you know what databases are, what are the core principles, how they work and what they are for (SQL, NoSQL, Graph), you will figure out MySQL, PostgresQL, Mongo, etc.
With this knowledge you will be always uptodate.