Quick answer
PC/mobile controls and an official-only prepare/hunt/sell/upgrade sequence.
The official first-loop step says to prepare a dog; no named dog data or recommendation is claimed. The official loop includes selling ducks before reviewing upgrades; no price or strategy is asserted. Use the listed PC clicks, R, E, or mobile buttons, then follow that visible sequence.
For Catch 1 Billion Ducks guide, use the official controls and loop first; this guide does not invent named upgrades, values, or recommendations.