Everyone so far has it covered. Learning more is always a good idea however if I was just beginning reading I would prioritize bass clef if my goal was to learn to sight read on bass.
I also find it so much easier to be able to just read treble clef parts as is than to have to worry about transposing like I would if I was given say a tenor clef part which I don’t read very well at all.
One thing that helps me when transitioning between bass and treble clefs though was to compartmentalize treble clef at the 12th fret and above to begin with and to read the melodies across the fingerboard rather than trying to read the lowest notes in lower positions. So if I saw a middle C in treble clef I would always play it on the 15th fret of the A string rather than on the 5th fret of the G string or the 10th of the D string like I might if it was in bass clef.
Once you get that down you can work on playing things down the octave.
An earlier poster also hit the nail on the head about looking at intervals. Begin to notice the intervals rather than the notes themselves and you will begin reading much more fluently in both bass and treble clef.
I also find it so much easier to be able to just read treble clef parts as is than to have to worry about transposing like I would if I was given say a tenor clef part which I don’t read very well at all.
One thing that helps me when transitioning between bass and treble clefs though was to compartmentalize treble clef at the 12th fret and above to begin with and to read the melodies across the fingerboard rather than trying to read the lowest notes in lower positions. So if I saw a middle C in treble clef I would always play it on the 15th fret of the A string rather than on the 5th fret of the G string or the 10th of the D string like I might if it was in bass clef.
Once you get that down you can work on playing things down the octave.
An earlier poster also hit the nail on the head about looking at intervals. Begin to notice the intervals rather than the notes themselves and you will begin reading much more fluently in both bass and treble clef.