Javascript is awesome and ES6 is way more than just awesome.
Overthinking is not about thinking something that surprises you or makes you want to know more about it. It’s much more than that.
A lot of things has changes over the decade but what about you? Are you being productive enough?
CSS3 is a upgradation to CSS2. If you are a web developer, then have a read.
Everything in life happens for a reason and lucky numbers are one them.