New Bike Newbie

Hello Everyone!

My dad is a contractor and was recently just given a road bike for free, I been using it this last month with some adjustments and have grown to really love it but was hoping if people can give me some advice on what to upgrade or should I consider buying a new bike down the line. The bike is a giant defy alux 6000 series butted tubing.

Super noob here so don’t know much and getting more serious about biking