in General: **We use "allí" when we point something that is close and probably we can see it (not "to side of") **"allá" when we talk about big distances: from country to country, place to place... far from. If we are pointing something, we definitely can´t see it. We guess.

la palabra Alli te menciona proximidad pero es muy especifica, y alla tambien es acerca de la proximidad y ubicacion pero no especifica exactamente donde The word ALLI is very precise for the distance, and It´s to use for places and ubication, and the word ALLA isn´t especific, it´s general.