How does TCP work, sliding window, cumulative acknowledgment?

Question

Computer networks

Explain how the "sliding window" method works with a cumulative confirmation type. I can't bring them together in any way.

A sliding window is when the sender is allowed to send a certain number of segments continuously, when a receipt is received from the receiver that the very first segment has been received, the sender sends a certain number of segments again, and so on. A receipt is sent for each segment sent.

A cumulative acknowledgment is when a receipt is sent saying that the last frame of the segment and all previous ones before it have been received. If, for example, a segment with number 4 (segments from 1 - 8 are numbered) with a total number of sent segments of 8 (and a window size of 8) is not received, then a receipt that frame 8 has been received will not be sent to the sender? Because there was no cumulation of segments. And will you have to send the entire segment again from 1 to 8?
This is how it works, am I right?