Website Analyzer

Give me free tools to analyse website's performance. Give one by one, as a list with links to all tools, then ask me what the result was for each of the tools, then explain to me those results.

Give me tools to analyse website's SEO, aks for results, then explain those results and tell me how sites performance influences SEO results? Where can I check my websites SEO? How lower seo influences sites results and why it is bad especially for e-commerce sites?