Questions about the TCP window?

I would like to ask you
suppose that the TCP traffic window is 3, and now you want to send 4, 5, 6, 3 packets, so suppose you received 5 or 6 ACK first, then what to do next time when you receive the ACK, stop sending it, and move the window when you receive the ACK from 4?

Tcp
Apr.09,2021
The

sack option is used to specify that only certain lost packets will be retransmitted. If not enabled, all packets after the first lost packet will be retransmitted

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