Of course, it's nice to have some seniors, where you can look over their shoulders. Usually, you don't have this ideal situation. Most of the time, I didn't have it, too.

You can use a lot of modern Internet resources.

I got a Learning O'Reilly Account. There you can find courses, videos and live events where you can ask questions. It's helpful.

Read a lot of good books/e-books, ask in forums and maybe in your town is a user group for that.

Just write the software and constantly look to improve. Your code from 2 years ago is in an ideal situation, much worse than your code now.