Transfer a Blog site to WordPress

Hi,

I have a blog site written using 3rd party software

https://www.homespacorner.com/

I want to transfer it to WordPress as I need to transform
part of it to sell products on Amazon; with all the plugins available
that will shorten my development time ( or not).

Any recommendation/references on the best practices on importing a 3rd party site to WordPress.

Many thanks

Mark