What should I do after tulips fade in spring? And what about daffodils?

After tulip flowers have faded, “dead-head” them by clipping off the faded blooms so that they won’t go to seed. Narcissi (daffodils) do not require dead-heading, so you can, just leave them as they are. The main thing that flower bulbs need during their post-flowering period is for their foliage to be allowed to die back naturally so the plant can put its energy into “recharging” its flower bulb for next spring’s performance.