As you can see I'm new to the forum and have made the decision to become more knowledgeable about the technical parts of bitcoin technology before I start my trips with bitcoin and other cryptocurrencies. How do I make a new wallet? What exchange can I trust?

The second question is: What makes a signscript and witness different in a transaction, and what are they used  for? What will I be using them for if I want to use bitcoin and other cryptocurrencies that call for a signscript and a witness?