In a basement bedroom I had a dead outlet. I replaced it along with two others, the light switch and the light fixture. Today I realize that the closet light (that I did not touch) no longer works (it is on the same side as the dead outlet- which still doesn't work asfter being replaced).
What could this be? I disconnected the dead outlet and stuill, nothing... This is my first time touching any electrical and I am lost!

How comfortable are you in handling electricity?

For your immediate need, my first suggestion is to go to the main service panel or a sub panel if your connected to the subpanel.

Make sure that the breaker has been properly re-set. Turn the circuit all the way to it's off position and then turn it back to the on position. If all of the circuits now work, then just repair/replace the receptacle.

If resetting the breaker does not solve the issue, then I politely suggest that you call a licensed electrician.

If you ask him/her to they can teach you some of the basics behind troubleshooting a circuit.

Also, may I recommend that you either purchase or borrow some books on basic residential wiring to get some of the foundational understanding of the wiring.