If you have bootstrap framework in the 3rd party libraries in your project then you probably do not want to touch the original sources but overwrite them. Here is how to do by compiling the less files.
Many developers many coding styles so it is important to set a naming convention on each project where you work in a team. There isn't wrong convention but there are many ways you can approach so agree on a pattern in order to make the code intuitive.
Here is an example to take away and modify by your preferences.