ffmpeg -c copy vs -copyts vs -copytb etc & similar options? What's the overlap, differences, significances, pros cons, how, why & when TO/ NOT TO use?

[insightz]

ffmpeg -c copy vs -copyts vs -copytb etc & similar options? What's the overlap, differences, significances, pros cons, how, why & when TO or NOT TO use?

ffmpeg -c copy vs -copyts vs -copytb etc & similar options?
What's the overlap, differences, significances, pros cons, how, why & when TO or NOT TO use?
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I am new to playing with ffmpeg and messing with AV containers, codeecs & tracks but have been reading a bit and gathered some of the following.

And googling does not bring up any source that clarifies the usage & implications between them; separately and/ or combined together at times.

Here's snippets from what I gathered, but have not fully clearly understood or comprehended the meaning or implication of:

(Some were from authors here on OBS): @dodgepong @Jack0r @WayZHC @sepultribe

Spoiler: Details/ Reference to old posts

https://obsproject.com/forum/threads/guide-how-to-convert-flvs-to-mp4-fast-without-re-encoding.6406/

ffmpeg -i %1 -c copy -copyts %1.mp4[/CODE]

https://obsproject.com/forum/resources/how-to-convert-flvs-to-mp4-fast-without-re-encoding.78/

ffmpeg -i input.flv -c copy -copyts output.mp4
The "-c copy" means it will just copy the audio and video tracks without re-encoding them.
The "-copyts" flag means it will copy timestamps, which should help with syncing audio and video.

https://obsproject.com/forum/resources/guide-batch-convert-flv-to-mp4-losslessly-with-ffmpeg.525/

Quoting from others posts:
P1:

The "-c copy" means it will just copy the audio and video tracks without re-encoding them.
The "-copyts" flag means it will copy timestamps, which should help with syncing audio and video.

P2:

-c copy is used to copy all video/audio/subtitles streams
-copyts copy timestamps from original source (does not create new timestamps)

Are there Pros/ Cons to "Copy Timestamps" vs "Create New Timestaps"?

-copytb copy timebase which is for example, the same thing as your timeline timebase

What is "timeline base" & adding this in addition to -copy & -copyts "brings what benefit"?