How to minimize request size for my Q2A website

Question

GT Metrix shows that request size need to be minimized: https://gtmetrix.com/reports/satechhelp.co.za/2Uyv2wIK

Additional questions:

1. Render blocking CSS / JS found (1 Render blocking CSS files

   - https://example.com/qa-theme/SnowFlat/qa-styles.css?1.8.3./qa-theme/SnowFlat/qa-styles.css?1.8.3)

2. 3 Render blocking JS

   - https://example.com/qa-content/jquery-3.3.1.min.js
   
   - https://example.com/qa-content/qa-global.js?1.8.3
   
   - https://example.com/qa-theme/SnowFlat/js/snow-core.js?1.8.3
    

3. Images not optimized 
4. Javascript not minified

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