Use HowTo structured data to explicitly tell Google that your content is a how-to.
A how-to walks users through a set of steps to successfully complete a task, and can feature video, images, and text. For example, “How to tie a tie or “How to tile a kitchen backsplash”.
If each step in your how-to must be read in sequence, it’s a good sign that HowTo structured data could benefit your content. HowTo structured data is appropriate when the how-to is the main focus of the page.
Properly marked up how-to pages may be eligible to have a rich result on Search and an Action on the Google Assistant, which can help your site reach the right users.
Source: Mark up your how-to pages with structured data.