Question about session keys and master secret

Hi all,

I have a confuse about specification about Session key that is defined as “Session keys created: Both client and server generate session keys from the client random, the server random, and the premaster secret. They should arrive at the same results.” in TLS handshake link below
https://www.cloudflare.com/learning/ssl/what-happens-in-a-tls-handshake/

However, in define of Master secret "The master secret is the final result from combining the client random, the server random, and the premaster secret via an algorithm. " via https://www.cloudflare.com/learning/ssl/what-is-a-session-key/

I witnessed that they are defined the same. But master secret continuously say thay “The client and server then use the master secret to calculate several session keys for use in that session only”. What thing generate other ? why session key same result as master secret as links?

If I correct, it maybe has a typo in Session key that should “The client and server then use the master secret to calculate several session keys for use in that session only” in https://www.cloudflare.com/learning/ssl/what-happens-in-a-tls-handshake/ of TLS handshake

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