Newbie at SEO, how to use keyword?

Hello fellow reddits.

sorry if my question seems stupid.

So, let's say I'm using wordpress and free Yoast Plugin.

And for example, in the focus keyword i insert "stock investment", let's say also that i have follow Yoast guidance and put the keyword on the title, subheading, paragraph, alt-text image, meta description, url, etc.

Does that mean that Google only track my focus keyword or everything in the text?

Let's say if i use keyword shitter, will it makes thing better (in SEO standpoint) to stuff 30-50 keyword that i got from keyword shitter in the post (assuming the content will still feel natural).

Or i just need to focus on 1 focus keyword per post?

Edit : Thank you

submitted by /u/wilstreak
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