SQL

The quickest payoff for anyone already drowning in spreadsheets. SQL is the language for asking questions of databases, and a short query, such as total sales by region last month, is often one of the first things a beginner writes. It is narrower than a general language: you will not build apps with it alone. But it is everywhere at work, used by 58.6% of respondents in Stack Overflow's 2025 survey, and it is a core tool in entry-level data analyst roles; Google's Data Analytics Certificate teaches it to people with no experience. Pair it with Python later if you want to go further.