how do you optimize different keywords for "same question"?

Hi talper

I would go for your site to be themed about psoriasis, and making it have everything a person would want to know about psoriasis, instead of focusing on say one question.
Most of your posts or pages can be keyword targeted like the longtail keywords i listed below from google keyword planner.

how to cure psoriasis
natural cures for psoriasis
how to cure psoriasis of the scalp
what is psoriasis
what causes psoriasis
symptoms of psoriasis
shampoo for psoriasis

As you add more content and add your site stat counter or google analytics's you will see what other keywords people are using to get to your site. Then you can either make some of those keywords in articles or scatter then around your site as a whole.

I did this exact method with one of my sites and the site gets organic traffic consistently every day. I turned off comments except on one post because i want it to run pretty much on auto pilot. I created a ebook with some of the sites content, made a video, added a checklist an added that to the mix. so i have my product bundle and adsense.

I hope that gives you some ideas on how to approach your site.

Blessings Janet

Could you share your domain name? There is a lot more to keywords and on-page optimization is only part of it.

Meta Title
Meta Description

That's the extent of keywords for on page optimization but keywords can be diversified in so many ways for content, social media.

For PPC keywords are something completely different.

How to go about finding content to write about? Research your niche or hire a freelancer. I only know so much about psoriasis but I bet I could write an optimized article on "Natural Remedies for Psoriasis" by simply Googling it and formulating the content for readability and flow.

You don't understand, because multiple relevant pages help rank other relevant pages.

It is better to do some on page optimization

you could have a seperate website dedicated to psoriasis. Include everything related to psoriasis in that. Make sure that you are covering all the keywords under this process. Then you should interlink all the pages as well as put external links on keywords to Google websites like youtube, wiki etc. this helps to create a faith with google and you should get good results in no time.