Does Goku in the manga use Kaioken?

Yes, eventually. As the story progresses, Goku gains more control and can use Ultra Instinct more freely.

Yes, Goku does have the ability to heal in the manga in certain situations.

Yes, Goku dies a few times throughout the manga.

No, Goku typically remains stronger than Vegeta in the manga. Their power levels keep fluctuating, but Goku often has the edge.

In the manga, Goku does fall into hell as part of a complex and adventurous storyline. This event leads to many interesting developments and challenges for him.

Yes, Goku manages to defeat Jiren in the manga after an intense battle and showing great determination and growth in his powers.

No, Goku typically remains stronger than Vegeta in the manga. Goku achieves higher levels of power and unlocks more potent forms.

Yes, Goku does meet Bardock in the manga.

Goku sacrifices himself to save the Earth from powerful enemies on multiple occasions in the manga.

Goku in the manga doesn't hit a power level of 8000. The power escalation in the story doesn't go that high for him. There are various factors and story arcs that determine his power growth, but 8000 isn't one of them.