Hello Olga,
1), 2) You did no install the parent theme correctly. Check now.
How to install the parent theme correctly? What I did wrong? I renamed the theme, nothing else.
3) Follow the docs and finish the translation of your site https://xstore.helpscoutdocs.com/article/30-base-theme-translation
Can you help me with this?
4) We plan a new update very soon and the release of the XStore AMP plugin. So, follow our updates.
When do you add the AMP plugin for the XStore theme?
5) Read this post https://xstore.helpscoutdocs.com/article/100-how-to-speed-up-my-website
Thanks!