Code triggering for opportunity save

Wanted to figure out which code/function is getting triggered when we are manually creating opportunity through UI on clicking save button.

If you can get me the URL of the request in your browser’s Developer tools (network tab), that makes it easier for me to answer.

Please find screenshots of network tab

I don’t think those are the correct requests you’re showing there. Those seem to be when opening the Edit view, not when saving.

Are you referring to this. only two request got registered when clicked on save
In this network call body is being sent