Is King of Pentacles a yes or a no?

This card leans yes. It carries forward movement, and in a straight yes/no draw most readers take it affirmatively.

The King of Pentacles is material mastery: wealth built and held, a business that runs, a provider whose provision is not in doubt.

The final card of the minors, and the most straightforwardly successful figure in the deck.

The vines have grown over him. He sits on a throne carved with bulls, robed in grapevines, one hand resting on a pentacle, a castle behind him. He has been in that chair long enough for the garden to reach it, and the castle is the only completed structure behind any of the four kings.

Yes/no readings are the most popular use of tarot and the one it is worst suited to. A seventy-eight card deck built to describe nuance is being asked for one bit of information, and most of what it knows is discarded in the process.

A more useful version of the same draw: read King of Pentacles as what shape this takes, not whether it happens. Prosperity, security, sound business judgement. Abundance that is stable rather than lucky.

Provide, invest, build. The card is entirely comfortable with wealth and does not attach a warning to it, which distinguishes it from most of the deck and from most commentary on the deck.

In an advice position it says enjoy what you have without apologising for it, and then use it. Taurus is not ascetic and this card sees no virtue in an unspent fortune.

Reversed, the lean weakens or inverts. Greed, materialism, wealth as identity. Controlling through money.

The control reading is the sharpest and is worth stating plainly: money used to determine what other people do, inside a family or a business, is a real dynamic and one this card describes better than any other.

Also read for a business overextended past what it can hold, which is the same appetite pointed at growth rather than at people.