Rapid development using Bootstrap - QR code component

What are you most proud of, and what would you do differently next time?

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What challenges did you encounter, and how did you overcome them?

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What specific areas of your project would you like help with?

I would like to use Bootstrap for rapid development(what I am more interested in learning from Bootstrap is how to design components.), but as a newcomer to Bootstrap, I'm not entirely clear on how to better utilize it. Often, the components provided by Bootstrap do not fully meet our project's requirements, necessitating some modifications. What are some better approaches to make these changes? Should I directly set new variable values? Add utility classes? Write a new class name and append it to the class attribute? Could you provide advice based on these types of modifications I might undertake?