Shop Joomla Virtuemart optimize under mobile, eliminate errors, turbo pages.

Shop Joomla 3.9, Virtuemart 3.6. You want to optimize for mobile, do not display several categories with goods, make turbo pages, correct the design of the module (the module boundaries in the template - do not show part of the block). It is also advisable to upgrade to the latest version. A prerequisite is that links to pages should not be changed to prevent the site from falling out of the search.