This is a tricky question. Lawyers don't really make decisions for their clients. Lawyers are supposed to issue spot, apply the rules, and give their clients the information they need to make the final decision. I'm sure clients often give their lawyers the authority to make decisions, but generally speaking, the client should be the one who has the final say in what risks to take on and how to proceed.
I make a lot of decisions every day, but like Marisa mentioned, I make those decisions with input from my clients or internal stakeholders. It's helpful to get input from other stakeholders before deciding on an approach. Different people bring different perspectives.
As a lawyer you make decisions about accepting a case. Make decisions about how to handle discovery, make decisions about what laws apply to the case and what defense might be available. Remember a good education is the key to making good decisions! Good luck!
I make decisions a lot - although I did more in my last job, when I was a director. Now I'm one step down on the hierarchy so there are those above me who get to make most of the decisions.
Jessica recommends the following next steps: