Stable income: Somewhat stable

Becoming a Spanish teacher as a side hustle can provide a moderately stable income stream for most people who try it. Based on online research and feedback, many individuals earn consistently by teaching Spanish. While there may be some fluctuations in student demand, overall, there is a decent baseline of income to rely on. If your best friend quit their job to pursue this full-time, you could say, 'You'll be fine,' with reasonable confidence. I'd rate it a 3 out of 5 because while there is a good level of stability, occasional fluctuations can make it less predictable than a traditional job.