The text on your website is going to be one of the most important aspects of SEO. There are a few ways your text will impact it: Headings, keywords, and readability.
Your page headings need to be relevant to what is on the actual page. It’s wise to also include your keywords in your headers.
You also need to be using multiple header tags. At minimum, you need to be using one H1 tag. But you also need to be using the other heading tags as well: H2, H3, H4, H5, H6.
In order for images to have an impact on your SEO rankings, they need to have alt text assigned to them. Alt text also impacts your website accessibility for anyone using a screen reader.