What will be the Capacitor Value corresponding to the crystal??

[Champak Kundu]

If I use 4MHz Crystal instead of 24MHz Crystal, what will be the value of CL1 and CL2 capacitor?

[AScha.3]

see ds of your crystal.

if you dont have any info about your crystal, take 2 cer.caps , 16p ...22p and test it.

[Piranha]

Read AN2867 and this:

https://blog.adafruit.com/2012/01/24/choosing-the-right-crystal-and-caps-for-your-design/