Ask HN: I've let my product dev skills fall behind. What would you use?

I&#x27;ve let my product dev skills fall behind. I&#x27;ve got the itch again. What would you use? Exp:C#.Net,ASP.NET,JAVA,C++,Javascript<p>http:&#x2F;&#x2F;bootswap.github.io http:&#x2F;&#x2F;connectwithcontractors.github.io