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The below image showing 2k resistor color code with four band:

2k ohm Resistor color code:

Red, Black, Red, Gold

Band	Color	Value
1st Red		2
2nd Black		0
3rd Red		100
4th gold		5{42041a7992ac3be9e9e29c856254fb498d8c7935d7cf8512da6802e8688e734a}
		2k±5% Ω

2k Resistor colour Code calculations are:

1st band= Red= 2 (1st digit)

2nd band= Black= 0 (2nd digit)

3rd band= Red= 100 (multiplier)

4th band= Gold= ±5% (tolerance)

Therefore, 20×100±5% ==> 2000Ω  ==> 2kΩ

And tolerance considered as ==> 5%of2000 ==>100Ω

Final assumed value of 2kΩ resistor is between 1900 to 2100Ω

Caution:

If resistor contains Brown and Red color bands then look it properly, this because red and brown appears to be very similar when it is already used in a circuit. Use proper light to do it.

Other methods:

Use a digital multimeter to check the value of a resistor. But DMM (digital multimeter) does not see correct values when a resistor is connected in a circuit, in such places color code comes handy.

Table to obtain 2k Resistor when not available:

R!seriesR2 using 1kΩ resistor	1kΩ + 1kΩ = 2kΩ

 

Color code of other resistors:

47kohm resistor- https://somanytech.com/4k7-resistor-col…verview-and-tips/ ‎

1k resistor color code-https://somanytech.com/1k-resistor-color-code/