Guys, so I researched a lot about this but couldn't reach a conclusion. How does chat app work on Android?
I mean you could use XMPP, SSE or socket. But how long is the connection kept open? And what's is the data flow chart from db to push notifications (FCM) to device?

Since we need https in android 9,is it okay to use self signed certificates? Secure enough?

Hi guys so I have a fairly simple spring boot backend with mongodb. I am starting out with this setup for my app. I dint choose something like firebase because it will lock me into their ecosystem.

My question is can initially just run my backend with Digital ocean droplet or I need dedicated hosting?
Can it be done with docker. Is it the only way?
If not digital ocean then which one? Vultr, hetzner, linode, aws lightsail?
What are the things needed. Am I missing something?

I know android java, kotlin.. So for iOs development what should I learn?
1.Flutter
2.React native
3.Swift
4.Objective C

Which and why?
I would prefer the one with lowest learning curve.

Hey guys, I have almost developed the backend of an app like reddit. My question is about authentication. How should I authenticate my user. Is phone number necessary to add phone otp?Because I don't want to get any legal trouble if someone posts objectionable content on the platform. Most of the apps today need phone number, I dont know why except reducing spam accounts.

Or shall I verify email by otp. But its hard to track disposable emails. I cant go for only gmail too as its banned in china. Email domains of china are weird.

Can I get into legal trouble for objectionable content posted by any evil user?

I dont want to go for auth.