I am a Freelance Full-Stack developer with experience building websites and scalable web applications. I specialize in JavaScript, with professional experience working with Angular and NodeJS.
Education
Bachelor's degree in Mathematics and Computer Science
In my opinion, firebase is good, it saves you a lot of time. But, for complex applications, it might become expensive and hard to use (limited in some ways).
If you're using PHP, you can try something like Heroku (also can become pretty expensive).
Or digital ocean (more developer-friendly) or was.
As for the database, I find no-sql databases (MongoDB for example) more helpful at the beginning(faster to develop). For mongo, you can use cloud.mongodb.com (they have a free plan).
So, to wrap things up, I think firebase is great for prototypes and not very complex applications.
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In my opinion, firebase is good, it saves you a lot of time. But, for complex applications, it might become expensive and hard to use (limited in some ways).
If you're using PHP, you can try something like Heroku (also can become pretty expensive).
Or digital ocean (more developer-friendly) or was.
As for the database, I find no-sql databases (MongoDB for example) more helpful at the beginning(faster to develop). For mongo, you can use cloud.mongodb.com (they have a free plan).
So, to wrap things up, I think firebase is great for prototypes and not very complex applications.