Best Way to Collect User Feedback?

Hey Hunters, I know that user feedback is very important when building a product, especially for startups. The problem is, I’m still figuring out the best way to collect it effectively.

Right now, I’m debating between:

Email: Sending out direct emails to users. But how should I structure them? Short & casual or more structured surveys?
In-App: Using a widget or pop-up inside the app. But where and when is the best moment to ask?
Feedback Tools: There are so many. Which ones are actually worth it?

I heard some use Google forms. Is this a good alternative to the ones above?

For those of you running SaaS or digital products, what worked for you?

Would love to hear what’s worked for you!