I don't do code reading or comprehension study. Reading code is boring. I typically create a list of small tasks that I want to achieve with the project. If the

I don't do code reading or comprehension study. Reading code is boring. I typically create a list of small tasks that I want to achieve with the project. If the task is big, I break it down into smaller tasks. Then I rank the tasks from easy to hard. This way, I can start learning about the codebase and achieve my tasks. In your case, frozen columns seems to be a hard feature. So I would start with ajax data source. I'd start with a simple SlickGrid example and get it to run. Then go find how SlickGrid sets up data source. Expand that piece of code to add ajax data source. Once I finished ajax data source, I'd dig into frozen columns. If you are working on a new codebase and worry about bugs, you just give yourself more stress. Bugs (that are not yours) are expected. If they aren't blocking your task, ignore them. Most likely, they aren't relevant to what you are trying to do.