Best way to keep tulips bulbs after bloom?

allow them to dry out and store in a paper bag in a dark and cool location

You can plant in pots and they will be beautiful next spring

That will depend on if you are putting them in the ground or if you are going to force them for indoor blooms

Get them planted. Preserve the green leaves and let them die off naturally, they refeed the plant nutrients for next year.

Yes to Lisa S. If the bulbs bloomed in a vase they must grow in the dirt and sun to recharge the bulb for next year. Come frost they will go dormant and come up next spring, if you are in a cold climate, that is.

If they are in a pot, place the pot outside (if it is warm in your area) or let it have light. Water now and then. You want the foliage to die back naturally. While the foliage is green, it is feeding the bulb. When it is completely brown, you can save the bulbs in a dry dark place and plant in the fall.

Another method is to get them planted in the ground ASAP. Then let the foliage die back naturally. Do not remove the foliage until it is brown and pulls off easily. It is ugly - but it is doing it's job of feeding the plant.

If you are limited to flower pots only, as in patio gardening. Just let them die back, but make sure they are in a big enough pot.

You can use bone meal, available at gardening stores and Home Depot, about a tablespoon in the ground before placing the bulbs in the ground. It is a natural fertilizer. Or hit the stalks with a little Miracle Grow water. If you don't have any of this on hand, no worry, they will probably do just fine.

When people take off the green and place them in bag to dry out, you may not get too much of a flower the next year. Sometimes they just dry up and die.

Once in the ground, if you live in an area that gets frost / snow in the winter, warm in spring and summer - they an be left alone.