Im interested in becoming a cyber security expert. I feel comfortable with my networking skills but im worried about my programming skills. How important is for a cyber security expert to have advanced programming skills? And what languages would you recommend.
Short answer: Start learning the security aspects of the technologies you already know.
Longer answer: the term "cyber security expert" is much broader than I think you realize. Like any technical field, there are lots of sub-areas, each requiring specialized knowledge. Even on this site you can see that no one person feels qualified to answer all types of questions - some people are cryptographers, others know about secure coding practices for C/C++, others know about secure coding for php / python / ruby, others know about firewalls and anti-virus configuration. You really have to be an expert in something before you can start thinking about how to penetration test it, or harden it against exploits.
Metaphor: your kid is sick, you take them to the doctor and the doctor says "I'm actually a plumber by training, but I recently took a course in what medicine to prescribe for which symptoms". Yeah, that's not good enough, I want my doctor to be a full expert in biology and understand why the medicine works, not just know which one to prescribe - similarly a "security expert" really should be a top-to-bottom expert in the technologies they are looking for weaknesses in.
Where to start:
If you already work for a company where you already have an assigned job, this will give you an area to concentrate your security studies. If you don't deal with a lot of code, then don't learn to code just for security, spend your time elsewhere!
If you are trying to apply to a "new grad" security positions at a company, then they will expect to have to train you anyway - you will have to learn their products and environment, looking for security holes along the way. You need to demonstrate that you "think like a gamer" - that your gut reaction to seeing something new is to say "what are the rules of this system, and how can I exploit them?". It's much easier to pick up the technical skills than to pick up this mindset.