I'm not sure which bike lock to get, as a 15 year old who just learned how to pick padlocks the other day I think that that's kind of scary. So, I'm just wondering what is a good bike lock to have.

I just thought that was a funny picture..... Moving on now. I used to commute on an expensive bike and I used 2 cables with 2 Masterlocks. I dont know what a potential theif would have to say about it, but I felt safe about it. If you have a reason to be worried about picking locks, you could always use a combination lock.

I recently got one of these. I love it. Very easy mounting, lighter than my 1980's Kryptonite, and offers some flexibility in locking arrangements. https://www.abus.de/us/main.asp?Scree...=4003318450532

get a kryptonite or an onguard ulock.

I use a Kryptonite Evolution mini U-Lock. On my fixed gear without locking wheel skewers, I use a cable for my front wheel and saddle in addition to the U-lock.

Take a look at Sheldon Brown's advice too: https://www.sheldonbrown.com/lock-strategy.html

It kind of depends what you will be locking your bike to. Each type of lock has its own advantages and disadvantages. A cable lock while light and flexible can usually be clipped pretty easily. Depending on the chain it can be flexible and heavy and may or may not be easily defeated (depending on whether the weak link is the chain or lock). A full size U lock has advantages and disadvantages compared to the the mini, but weight and size sometimes becomes an issue.

This is not a exhaustive list so some research on your part will be necessary. What will you be locking the bike to? Is theft a big problem in your area? Do you prefer one style lock to another? Is weight an issue? how long will you be leaving your bike unattended? etc...