Which room, which night, and who is already sitting in the seat next to you. Then hour six turns up and decides the rest. Four things run a live cash game, and every one of them is something you can look up instead of guess.
Game selection is the highest-value decision a cash player makes, and a spreadsheet never answers it. Your results by venue, stake and day of week show which room pays you and which one you keep driving to out of habit.

You worked the blue cap in seat 3 out over four sessions: his river bet is always value. Six weeks later he sits down again and the read has gone, because it only ever lived in your head. Online players get a HUD for this. Write it down once and you keep it.
Decisions degrade with fatigue, and hour six against a reg who never bluffs is where feel runs out. The drills exist for exactly that moment: pricing, combos and ranges trained until they arrive without effort.

Hourly, bb per hour, win rate by stake, and variance shown in context so a rough fortnight reads as a rough fortnight rather than a crisis. Memory rounds up. The record does not.

Unlimited sessions, every venue and stake breakdown, player notes and variance in context. One better game selection covers the year.