Hackers and scammers never stops inventing new strategies for stealing from people. But, how you avoid these scammers is still the same ways stop installing apps from unknown sources, make use of the main app stores whenever you want to install an application.
One thing to add up in here is that, the greatest risk you could have when dealing with applications is upon right after installing it. To be exact, the permissions that we are allowing the application is what makes us be in danger. You know why? Our operating system in desktop or in mobile is actually doing their part to protect us, but let us do our part to keep ourselves secured by just allowing trusted permission request for them to be limited in accessing our information.
Stop opening unsolicited mails, when you see mails from people you don't know, just delete it immediately. And another thing is to avoid giving out information about yourself, because when they lay hands on your information they can as well use it to do something against you. I'm always careful with how I use cryptocurrency because I know that they are not like PayPal, there is no way you can reverse your money, once it's sent, just say bye-bye to it.
There are also cases that hackers are doing spear-phishing, in which they try to target certain individuals for them to hack. One lesson about this is to keep on track of our social media accounts and to limit posting information that might catch the eye of hackers. Use the privacy features provided by the applications.
I think the better way to avoid getting hack is to never visit or install any untrusted software and websites because even if there is a privacy features if you installed the wrong software "likely planted with some kind of virus" you are still prone to phishing or hack. Or better use a personal computer that doesn't connected to the internet.