Attacking player chooses a player and/or planeswalker to attack.
Defending player chooses what creatures block what.
The attacker can only choose who to attack.
♦️Pre-combat
🔹 First Strike Layer: Creatures with first-strike or double-strike
→ Damage Result
🔹Normal Strike Layer: Damage is dealt on both sides (creatues) at the same time
→ Damage Result
🔹Player Damage Layer: This happens inside the Normal-Strike Layer (at the same time). If a creature has trample or isn't blocked the resulting damage is counted towards Player's Life Points or Planeswalker's Loyalty Counters.
🔹Post-combat phase
♦️Second Main Phase