Installing some kind of apps that you dont really know is actually the easiest way to get hacked, since most of these applications can easily be some kind of malware, so installing an app is just the easiest way to lose your fund or your account here in cryptocurrency, if someone is telling you to download an application it is obviously a red flag already so make sure to block him quickly and dont entertain him anymore or straight up report his account.
Also most of the time, it is mostly on phishing, so if someone wanted you to fill up some webpage with your information, that could also be an indicator that they are trying to scam you, to get your funds, the best way to avoid is just being aware of this kind of things if you know about it there was a very low chance that you will become a victim of it, most of the time, clicking the link would put you on a similar page like for example your bank webpage, or even your social media webpage, if you know that you are logged on your account then, you suddenly just needed to relogin again when you click some links, always wonder because it might be an indication that you are dealing with a scammer or a hacker.
Those who have good money and use their mobile phones to store their financial apps or data shouldn't use the same phone for regular use. They shouldn't use the internet on that phone, open links, install apps, or do anything extra, and they should have an extra phone for all these things so that even if someone tries to hack them or access their funds, they wouldn't have anything to access since their financial data or applications aren't on the phone the attackers have accessed.
If someone can't afford to do this, for security measures, they shouldn't have any financial apps or data on their phone because we do a lot of things on our mobile phones, and we might make mistakes, and a small mistake can cost us a lot, so it's better that we stay careful and keep these things away from danger.