Rhythm comes first
Stage 1 was about which note — the pitch, the string, the finger. Stage 2 is about when: where a note falls against a steady beat, and how long it lasts. That's rhythm, and the first thing to know is that it's learned away from the violin.
Rhythm is one plain idea underneath everything else: a steady pulse, divided. A pulse you could tap with one finger, split into longer and shorter pieces. You feel the pulse, say the pattern, clap it — then you pick up the bow. If the rhythm is solid before your hands get involved, your hands have one less thing to get wrong.
You already have most of this
You come from tabla. That whole tradition is built on exactly this — holding a pulse and dividing it cleanly, learned by voice and hand long before the drum. Most of Stage 2 is learning to read rhythms your hands can already feel.
One thing to settle now: this course counts the standard Western way — "one, two, three, four", "one and two and". Not because it's better than what you know, but because it's what every teacher, method book and play-along recording uses. Keeping your counting the same as theirs means the page and your voice always match. (There's a short optional lesson later on how your own syllables map across — but everywhere else, the course speaks in "one and two and".)
Feel the pulse on its own
Keep it going through a gap
The pulse doesn't stop when the sound does. Here two of the four beats are silent — but your count runs straight through them, so you land back in exactly on time.
Put a pattern on top
Now the pulse stays in your foot and a rhythm goes on top in your hands — the two running independently, the way they will for the rest of your playing life.
The usual mistake
Letting the pulse follow your hands instead of the other way round. Beginners slow down at the hard bar and speed up through the easy one without hearing it happen. The beat is fixed; the hands obey it. When you practise, the thing in charge is the metronome, or your counting voice, or your tapping foot — never your fingers. If your playing and the metronome keep drifting apart, the metronome is right and you adjust.
Try
Tap a slow, even four on your knee — "one, two, three, four" aloud — and keep it dead steady for a full minute without drifting or speeding up. Harder than it sounds. That unwavering tap is what every rhythm in this stage is measured against.