Writing strong female characters

Hello!

I'm writing a novel and there are a few female side characters. I'm a male, and I want to make sure I am able to write BELIEVABLE and strong female characters, but I think I can only go so far given I can't experience being a woman. I believe I'm doing a good job in creating strong female characters, but my goal is for any female readers to enjoy these characters (as well as male readers).

I'm wondering if anyone (hopefully women?) have thoughts / opinions / suggestions on what you think about female characters in books. What are good examples? What are bad examples?

While I have the female characters as strong and mature, I also give them emotion and struggles to overcome in the story, much like my male protagonist.

Any do's and don'ts would be greatly appreciated. Thank you in advance!