Unfold everything under 1 headline while keep other headlines collapsed

Let’s say I have the following contents in my page:

Headline1

> subheadline1a

Headline2

> subheadline2a

> subheadline2b

> subheadline2c

Headline3

> subheadline3a

> subheadline3b

And there are also lower levels of headlines under each of them that I didn’t write out here.

What I’m looking for is:

Scenario 1: I only want to look into Headline2.
My desired practice is: After I fold all, there should be a shortcut to unfold everything under the headline where my cursor is located, say Headline2, while keeping Headline1 and Headline3 collapsed.

Scenario 2: I only want to look into subheadline2c.
My desired practice is: After I fold all, I manually unfold Headline2, which then displays the level 2 subheadlines. Then, I click anywhere in subheadline2c, and there should be a shortcut to unfold everything under subheadline2c while keeping subheadline2a and subheadline2b collapsed.

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