Every new tool is a bet.
The bet is simple. The hours saved will be more than the hours spent learning. Most of the time, solo builders lose it.
The framework that promised to save a month. Three weeks in, still fighting the config. The library that was going to replace two hundred lines. It replaced them with a dependency and a migration guide. The editor everyone swore by. A weekend gone to keybindings, and the old one worked fine.
None of these were bad tools. The bet was just bad.
A tool has two costs. The one on the box: install, import, run. And the one nobody prices in. The weeks before it's second nature. The abstractions that leak. The day it breaks and the docs don't cover why.
Solo, there's no platform team to absorb that cost. No one else learns it for you. You read the changelog. You debug the upgrade. Every tool you adopt, you also keep a relationship with.
The fastest builders are not the ones who learn the most tools. They learn the fewest.
They pick a small set. They go deep. They say no to the rest, not because the rest are bad, but because attention is the budget, and every new thing spends it.
The skill isn't learning fast.
It's knowing what to leave unlearned.