What do you read to improve productivity?

In My Humble Opinion
1

What are some websites or other sources that you read regularly to improve productivity?

I do not know if productivity is the right word since people usually think of self-help websites when it’s used. I’m talking about anything you read in order to get better at some area of your life. Some examples:

Clothes: I read /r/malefashionadvice to improve what I wear, and /r/frugalmalefashion to do it on a reasonable budget.

Software/Technology: I read Lifehacker and the reviews on Recode. Lifehacker has other productivity tips, but their psychology advice is very shallow and nearly useless. I’m really looking for more sources to improve in this area.
**
Finance:** Consumersearch is great for product reviews.

2

Psychology and general life improvement sources:

Eric Barker Barking Up the Wrong Tree

Lots of cites for all of his stuff.

http://zenhabits.net/

3

Nothing else? Is everyone just playing candy crush with their free time?

4

A coworker recommended a book called Getting Things Done, which I have yet to even look up because I don’t know how to get things done.