Hi,I’m new in unity.
I wanted to ask, where can I start learning javascript?
Take a look at the GUI Essentials to learn the interface and the Scripting Essentials to get you started with scripting:
I also would highly reccommend Unity3DStudent as it has many bitesize lessons which teach you a new technique each time and actually explain what each line of code is doing. Then it has you do “challenges” where you complete a task based on the lessons. Brilliant and free! (Start with the “Essentials” modules) -
http://www.unity3dstudent.com/category/modules/
Once you’ve done most of the lessons on there you should be ready to start making some simple arcade games of your own. Finally just build up from there. If you get stuck search past questions or post a question here. Everyone is happy to help 
Good Luck!
I’d recommended just diving right in. Most online learn Javascript sites are all for web development. If you already know a programming language like C or C++ it should come very easily. (Logics the hardest part) For everything else I’d advise making best friends with the Unity Scripting Guide. Analyze the sample scripts and pick up on how they run and the rest should come easily.
I learned by this guy: TornadoTwins he is a really good beginners teacher.
thanks guys