@Ballsman The only thing that matters is having the keyword in your Page Title/H1. On all of my sites, I have the H1 and Page title as the same thing. I get my writers to write freely, without worrying about placing keywords in the article. This was something that worked many years ago, keyword density isn't really a thing anymore. What you want to do instead is focus on creating content that answers the search query better than your competition.
Please note, you can + should however add related keywords inside the article, and super related + combination keywords creatively in the page title, so for example if you had two major keywords in an article:
kw 1: cabbage health benefits
kw 2: cabbage health hazards
Then your page title / H1 should be something like: Cabage Health Benefits and Hazards (this is going to cover both topics and will show up in the search results for both queries, but I would only do this on a site that has a lot of topical relevancy or is has some authority in the niche, otherwise it may sometimes be hard to rank for both) - then you also have to structure your content to answer both questions. If a user was to land on your page, they would get both the benefits and hazards.
Coming back to the original question you asked. If your keyword is "cabbage health benefits"
You want to create an article like:
Page title & H1: top 10 cabbage health benefits OR even a variation of "cabbage health benefits" will work e.g. "Health benefits of eating Cabbbage" they are both the same thing, you want a title that reads well even if the words get shuffled around. (I am not saying the variation I provided reads well, it is just an example)
The rest of the H2,H3 etc. should be on point, they should answer the search query and introduce sections in your article that are benefits along with any other super relevant information so your article may look something like:
H1/Page title: Cabbage Health Benefits
H2: Introduction
H2: Top 10 Cabbage Health Benefits
H3: Benefit 1
H3: Benefit 2
H3: Benefit 3
...
..
H3: Benefit 10
H2: Should you eat Cabbage daily?
H2: What are the alternatives to eating Cabbage?
H2: Final Words
You need to research other ranking articles and find other relevant information that you can insert in the article to get something cohesive that addresses the benefits and anything else that is super related completely. Don't insert random things that are not super related, it is better to add another article because the search intent will change and unless you are a big authority in the niche it is hard to rank with a single page for multiple keywords with different search intents.
Good luck!