Google "resistor color codes"
U'll find that those 220R (red red brown +gold) are suitable as current limiters for LEDs
Other /much used/ resistor value is 10k (+/-) often used as pullups. (brown black orange +gold)
Thees resistors /gold/ adre within 5%
The 1% tolerance have 4 color bands; 1.st three for value 4th for additional zeros, and at last brown