The scenario.

I'm playing a level 3 Sorcerer, using the Shadow Sorcer Origin provided by Xanathar's Guide to Everything. Before combat began (or in the immediately previous round, if you like) I cast Darkness, using my Eyes of Darkness feature on a dagger that I'm holding in my hand. I hold a Rapier in my other hand. Because Eyes of Darkness allows me, the caster, to ignore the effects of my own Darkness spell, I am perfectly capable of seeing through my own darkness but my enemies cannot see me. If they become blinded (per the Condition).

This round, I run up to my target, a Human Bandit, using 15 feet of movement. I drop the dagger on the ground, and then use the Rapier (the character is Drow, so they have Rapier proficiency) to attack the bandit. Regardless of whether the attack connects, I then use my remaining 15 feet of movement to move to another point within the 15 feet radius sphere of Darkness … I left the Dagger where I dropped it. This movement does not trigger an Opportunity Attack, because an OA requires the person making the Reaction to be able to see their target, which they can't in this scenario.

So here's the core question:

1. Does the Bandit know where I am, beyond the obvious knowledge that I'm still somewhere inside the sphere of Darkness?

2. Does this sequence of events require me to use the Hide action to
   conceal my new location, or would the Bandit implicitly know my new
   location, through implied noise that my movement creates?

3. Is the Bandit's knowledge of my new location contingent on their own
   Perception check against my Stealth abilities, or would they be able
   to know my position without any checks at all?

   In the Player's Handbook, in the section for "Making an Attack", there is the following information (relevant parts emphasized by me):

   Unseen Attackers and Targets

   Combatants often try to escape their foes' notice by hiding, casting the invisibility spell, or lurking in darkness.

   When you attack a target that you can't see, you have disadvantage on the attack roll. This is true whether you're guessing the target's location or you're targeting a creature you can hear but not see. If the target isn't in the location you targeted, you automatically miss, but the DM typically just says that the attack missed, not whether you guessed the target's location correctly.

   When a creature can't see you, you have advantage on attack rolls against it.

   If you are hidden—both unseen and unheard—when you make an attack, you give away your location when the attack hits or misses.

   My takeaway from this is that simply being in Darkness is enough to fully conceal my position, but that attacking is enough to give away my location. Does this imply that even if I move 15 feet away afterwards, that I've made too much noise this round to fully obscure my position, or is the bandit only informed that I was in melee range in front of them at some point during the round?