I made a blog on blogger and change settings. But, here are the things confusing me.

A)What to write in the blog description, meta tag description, and in the post description. When I wrote the blog description than it’s showing on the blog page. Is, it necessary to write that description?

b)I’m using magma news theme so technically I can’t show pages like(home/privacy/contact us, about us) on the header section and the footer section of the page because Home, privacy pages are showing in the left side of the header section. I made these pages manually and now it’s showing in the sidebar column of the blog. How can I show these pages in the non-list mode at the top or bottom of the blog?

4)I don’t know SEO. So, what are the things I should keep in mind?
5)I want to write the blogpost in Hindi but some icons and menu icons names are in English. So, I should completely write everything in English or Hindi?
6)There’s a Menu icon name Digital Marketing on my blog. I try to write a sample post and gave Digital Marketing, Internet marketing label. I use the link of the label and linked with the Digital marketing main menu icon. Now, my question is do I need to link the menus with the label link or I should use the category links to connect with the menu?

6)My blog name is https://myhindibuddy.blogspot.com/. I have yet to write a blog post because of these above problems. I am not a very fast learner so it takes a lot of time to first understand the blogger settings and the theme settings. There are so many settings to understand. I know I can write some good stuff especially on digital marketing, e-commerce, jobs, and a lot more. I want to write because I love all this. Can you all guide me on what should I do before writing a post. The research part, the SEO part, the keyword part, the pic editing part?

Regards
Sumit