see title please
cocoapods is now falling out of favour since Xcode has Swift Package Manager which is a far simpler means of adding third party support to your projects. Most vendors who provide third party frameworks are now supporting Swift Package Manager.
There are heaps of videos online that explain how to use Swift Package Manager and a simple search will give you plenty to watch.
codesigning:
There is a course on CWC+ named “iOS Foundations with SwiftUI (2020)” which has a bonus module that explains the process of submitting an App to the App Store so that covers the developer certificate requirements you need for your project.