ITextSharp is a wonderful library written to interact with PDF or create new PDF files, the latest version available is called iText7. Since ISO 320001 , PDF is a standard portable document interface and its extensive support for digital signatures makes PDF the default go to document types to preserve document integrity in business scenarios.
Nearly every application needs to manage users, roles, rights, authentications and authorizations. Asp.net Core works well with the default identity framework provided by .net team.
If you are starting a new application, you can start right from the code/model first approach. In most cases you have an existing database with an existing application in that case we will need to use scaffolding to create our models automatically.
How to identify the dependencies? Its really simple. You need to divide your application into smaller possible components. Lets assume the smallest component we are talking about is a class. A class provides the definition of attributes and behaviors, of an object. An object can perform certain responsibilities (behaviors). To perform these responsibilities they may need to initiate other smaller components. Tada! here comes the dependency.