7.Where did the high priest enter once each year?

Into the Most Holy Place—the Holy of Holies, the second and last room of the Tabernacle.

The phrase "the errors of the people" may be translated, "the sins of ignorance of the people." The Day of Atonement, as well as the sin and trespass offerings of the people of Israel, provided a Divine covering and satisfaction for sins committed in ignorance—sins that people committed unintentionally.

There was no provision under the old covenant, nor is there under the new covenant, for deliberate, intentional, willful, presumptuous sinning.