Mac – Trackpad gesture to select text

Ok, it should be very easy one to figure out but I can't do it, so I'm asking experts. I want to know which one is accurate trackpad gesture for selecting text. Is it "three finger swipe right" or "one finger fixed with two fingers swipe down" or "three fingers swipe down" or any other ??

This is the context in which I'm asking this question.

I'm trying to automate my text selection to get highlighted in preview and to get copied to clipboard in web browser. Two different things , but selecting text & assigning gesture is common.

The way I select text in browser is by "three fingers drag right & down simultaneously".

This is how automatic highlighting worked in preview: selected text by "three finger swipe right" – assigned action "^ command H" to this gesture using bettertouchtool app & selected text is highlighted. But can't use same technique in web browser to automatically copy my text with trackpad gesture.

When I use "three fingers swipe right" gesture in browser it only selects few words or one line & not the entire set of lines/para like in preview. So what will be right trackpad gesture to select text in browser. I hope its clear now.