This is a quick and basic overview focus on evading radar cross section, which is only one of the many aspects of stealth technology.
Stealth technology applied in aircrafts like f-117, f-22, f-35, b-2, features ALL STEALTH aspects, which mean they are made to not only have small radar cross section, but also counter infrared and heat seeking sensors, radio and radar emission signals, smoke from engines or contrails, visual and acoustic detections, etc.
I wrote this because there seems to be some people who are misinformed, thinking that stealth technologies have been defeated, citing the incident where an f-117 been shot down. The downing of the f-117 is in no way evidence of stealth being compromised. Doing a little research will reveal the truth to you.