How to Optimize Java Script and CSS for Website Better Speed?

Any One Suggest me for make my website speed better from optimize CSS or JAVA Script Code. i have Checking in W3 validator but finding more warnings. Anyone Suggest me how to optimize this.

What do the warnings say?

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That will show you errors in your HTML or CSS, but it won’t show you issues impacting the performance of your site. For that you need to use something like PageSpeed Insights.