Google PageSpeed Insights Question earn by blogging adsense income

I'm currently at a 70/100 on Mobile for a family friends' website using this tool on Google but have come across a few things I'm unsure of how to fix or if it's something I can even fix (being new to websites/seo) or should fix.

Could someone ELI5 what these following things mean?

1. Remove render-blocking JavaScript

2. Optimize CSS Delivery of the following

submitted by /u/Jasons2334
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