The kinds that are good. I've never had an issue finding a job. The only scenario I could think one would fail are:

You can't communicate clearly.

You can't communicate your skills clearly.

You can't communicate your experience clearly.

You have no idea what you're doing and it shows.

You live in a place that is not a place for programming jobs.

Your skills don't match the jobs you apply for.

To reach that level of competence is the same in anything else. Dedicate yourself.

I'm going to show you a stack of books I have sitting next to my desk - these are just the few I've been using in the last 12 months. Some of them I read over and over. Others I am reading, taking notes, reading more and putting into practice. Other books I read on my kindle. I also listen to audiobooks and courses from Online Video Tutorials & Training at Lynda.com on my way to work and on my way home I listen to dub reggae to relax and keep a positive mind.

Look at this stack of books and ask yourself if you've done the same. This in addition to coding, being a parent, being a husband, as well as performing live music, planning shows, and the other things I enjoy doing.

(Notice the stack of graphic novels next to it for inspiration to my creativity)

Don't waste your time else you are wasting your life and you only get one. Value your time and so will others. Become the asset and you have nothing to worry about.