My biggest advice is to track your heart rate somehow. Even cheap, crappy smart-ish watches can do it. Many people come out of the gate way too fast. If you are out for a jog, and your heart rate is in the 180's, you'll probably feel like crap the next day. It can be good to have runs that push your limits occasionally, but most of the time, you want to keep your heart rate steady and lower than you'd think. Feel free to walk if you feel your heart rate is too high. From there, you can decide what your goals actually are. For example, if you want to run a marathon, you'll obviously have different training needs than if you are looking to PR a mile.

Lastly, figure out how good your running form is. Everyone knows how to run, so no one ever puts much thought into their form. Every day, I see people running with really inefficient form that has to be hard on their joints. It's tricky to adjust form, but certainly possible