Find a place you can return to
A repeatable view is more useful for learning than a new location every evening.
Start nearby
Choose a place within walking distance that has both an open sky and one artificial light source. Visit in daylight first. Look for a safe place to stand where your tripod will not block anyone.
On the first evening, keep the frame simple. Return a week later with the same lens and position. The clouds, lamps, and time of sunset may have changed. With the composition held steady, those differences become easier to see.
Write down the useful details
A notebook entry can be short: where you stood, when you arrived, which exposure worked, and what you would change. Include the route home and any access limits. Learning from a place also means understanding when you should leave.
Keep one reference photograph from each visit. Over several evenings, you will have a small record of what the light does in a place you know.