The Reddit thread asks a fair question: if someone is starting a spreadsheet journey today, what single function should they learn first? The most upvoted answer, VLOOKUP or its modern successor XLOOKUP, is a solid choice, but it reveals a deeper truth about how we think about data mastery. The instinct to point to a lookup function makes sense on the surface: it connects tables, finds values, and feels like a real step beyond basic arithmetic. But focusing on a single function risks turning a journey into a trick. The real unlock is not VLOOKUP. It is understanding data structure itself.
Here is what we mean. VLOOKUP and XLOOKUP are powerful tools, but they are remedies for a problem that should not exist in the first place. When a user needs to look up a value across tables, the underlying issue is often that their data is not organized for analysis. They have a mess of rows and columns that require a function to patch together. A beginner who learns VLOOKUP first learns to work around poor structure rather than build good structure from the start. They become skilled at patching, not at designing. The function becomes a crutch that delays the day they must confront how their data is arranged, and that day always comes.
A more practical first step is to learn how to normalize data: how to keep a single table clean, with one row per record and one column per attribute, free of merged cells and blank rows. That skill makes every subsequent function, SUMIF, INDEX-MATCH, even PivotTables, dramatically simpler. Once a user understands structure, XLOOKUP becomes a straightforward tool rather than a mysterious incantation. It is not that lookup functions are unimportant; it is that they are downstream of a more fundamental skill. The community's instinct to recommend them is not wrong, but it skips a step.
For someone starting today, our advice is simple. Do not ask which function to learn first. Ask how your data should be arranged so that you need fewer functions to answer your questions. Spend your first hour learning what a tidy table looks like. Then spend the next hour on XLOOKUP if you must. But know that the person who masters structure first will overtake the person who masters lookups first, every time. The spreadsheet journey begins not with a formula, but with a clean slate.