The tutorial has been designed to be followed along, so you could start from the beginning through the end. At the end of each lesson, there will be a link to the whole code on GitHub.
If you're using Bootstrap 3 CSS, clone the code from vuetable-2-tutorial-bootstrap instead.
If you're using Bulma CSS, clone the code from vuetable-2-tutorial-bulma.
You can PR on any error you've encountered. No matter you think how small it is, please do not worry. :)