Skip the brown bag with flour or rice

If your avocados are significantly underripe and you need them soon, it's best to head to the store for some that are riper. However, if you have a bit of time, you can effectively ripen them overnight or even in just half a day.
A popular method you might come across online suggests placing unripe avocados in a brown paper bag with rice or flour. While using a brown bag is indeed a good idea, you might want to reserve your dry ingredients for other uses.
The concept behind this method is that by putting your avocado in a brown bag and sealing it, you trap the ethylene gas that the fruit emits, which speeds up the ripening process. However, adding flour or rice won’t significantly reduce the ripening time, as they don’t produce any additional ethylene. Instead, it’s more effective to include fruits like bananas or apples in the bag with the avocado, as they release extra gas that can enhance the ripening process.
Keep avocados out of the microwave

A microwave can perform various kitchen wonders, but it's best to keep it away from your avocados. Many online food enthusiasts suggest using it to quickly soften avocados, but this method merely heats them, compromising their texture and flavor. While it may make the avocado easier to handle, microwaving only cooks the flesh, so don’t expect the same taste as a perfectly ripe one.
A more effective way to use heat to speed up the ripening process is to place your hard fruit on a windowsill, where it can soak up sunlight and become wonderfully soft. Alternatively, simply leave them on your countertop — no extra effort needed. Keeping them at room temperature allows them to ripen naturally, unlike refrigeration, which slows down the process.
Once your avocados have reached the ideal consistency for mashing, cubing, or slicing, be sure to use the right tools. Avoid metal knives; opt for ceramic or plastic instead to help maintain their vibrant green color for as long as possible.
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