How to ripen avocados

This is what i gathered so far..

1. Avocados ripen when they are picked.
2. Some types ripen with skin darkened while other varieties have skin stayed the same.
3. The only sure way is to feel the skin.
4. To choose avocados, hold them gently in your hand & press with pad of your palm. Dont press with your fingers as it will bruise them.
5. Pick those that are firm upon pressing or just a little bit of give.
6. Dont buy avocados uneven firmness - likely to have been bruised.
7. At home, keep in cool room temperature till fully ripen - may takes two or three days.
8. To speed up ripening, place them in a bag with banana or apple.
9. When ripen, they give a little without resistance upon pressing.
10. Sliced avocado flesh with speckled or brown in parts, or has brown veiny network running thru it has started to turn bad. Cut those parts away or otherwise throw the whole fruit away.