HTML text: do I need specific tags to use text?

Question

What I want to do is

<div>some text <span>different text</span> more text </div>

I wasn't sure if I needed one of <a><p><h1> tags to use text or if I could simply just write it with just div.

Does it affect proper markup or SEO?

Also in cases where I am using the header tags <h1><h2>, etc. How many can I go up to? Such as <h7>+? And just wondering, can I use the same heading as many times as necessary right? As in, if I declare <h1> to have some font declarations can I use it multiple times on a page?

Answer 1

Just text without any formatting, without any position, without anything, just text (which will look very bad and completely NOT USER friendly, like this answer!) divs are okay.

You may even just write the text. There is no need to put divs if there is no need of formatting of any kind.