A basic operation doubt: in Track View, if I have a clip that starts, for example, in 1:03:123 and I want to duplicate it so it also appears in 1:04:123, or 5:03:123.
What is the easiest way?

Hi. You could turn snap to "move by", and Ctrl+drag to new location.
All the best.

What about the "Go To Time" feature. I have this mapped to keyboard command "G"
 
 . . . so you select the clip, then use "Shift-G" to snap to the beginning of that clip, Ctrl-C Copy the clip to clipboard, then click "G" (Go to Time) . . . and edit the event time to the exact location, then Ctrl-V Paste the clip to that new time.
 
In your example "Shift-G" would snap to 1:03:123 . . . and you would only have to edit the first digits of the "Go To Time" before Pasting the clip to the new time.

Maybe I'm not understanding the question, but I generally just grab the beginning and end of a clip and drag/snap it to the nearest bar. this does not move the timing of the data inside the clip.  I can then paste the clip at the new location, right on the bar, and the data inside lines up where it should.
 
For example, if you data starts at 1:04:123, I drag the start to 1:04:000 and the end to 5:04:000.  Now I have a 4 bar loop that I can paste where I want.

All of the methods mentioned so far work well and are useful in particular crcumstance. Changing to 'snap by' as described by Ken  would be the one I use most. Another is with the track in question selected, set snap to whole bar and select the entire bar range on the timeline ruler then copy and paste. This is also useful if the selection to be copied involves more than one track.

davec69
Maybe I'm not understanding the question, but I generally just grab the beginning and end of a clip and drag/snap it to the nearest bar. this does not move the timing of the data inside the clip.  I can then paste the clip at the new location, right on the bar, and the data inside lines up where it should.
 
For example, if you data starts at 1:04:123, I drag the start to 1:04:000 and the end to 5:04:000.  Now I have a 4 bar loop that I can paste where I want.

This is how I do it too but I think there's a key modifier that will lock the copy to the original clip's start time during the drag/copy, just never remember what it is.

"Move By" is your best friend. I use it almost exclusively.

kevinwal
 
This is how I do it too but I think there's a key modifier that will lock the copy to the original clip's start time during the drag/copy, just never remember what it is.

Are you thinking of holding Shift while you drag the clip? If you hold Shift while moving a clip to a new track or take lane it will snap to the horizontal position.

I this case I always use NUDGE function and I move clips all the time. Let say your project meter is 4/4 and clock is set to 48 then 192 ticks is equal to one measure. (Number of ticks is different for different meter and clock settings).
 
1. Copy clip to an empty track
2. Set NUDGE 1(press 5, or go to Preferences) to "measure" or 192 ticks, or 96 for half measure, or 768 tick for four measures, etc, depending where you want to put your clip
3. Highlight clip, move it (Nudge) with left with  "1" and or right with "3" keys
4. Put the clip back to original track with Nudge up or down (keys "2" and "8), or SHIFT mouse.
 
Obviously you can do it all in original track, without copying to an empty track, but just find it safer that way.

...wicked
"Move By" is your best friend. I use it almost exclusively.

I don't see "Move" neither in EDIT nor PROCESS nor clip menu. Do you mean drag with Snap set to "by" ?