Beginner of the guide for senior developers

I would like to look for some help. I became a senior developer of a team recently, but I think I struggled to start with it. I understand the business, but how to implement it in a development tram is another issue. Is there anyone who can give a guide on how to manage a development team and how to have each member work independently in the module in another? How can I divide the program into modules using Laravel? I researched in the laravel module library, but it seems there will be a lot of files to maintain and the depth of the code hierarchy, as it seems bulky, as I can imagine. That's fine?

Thank you.