Some of the safe ways to download real wallet apps are by visiting official websites, such as the coinbase website. Make sure you visit the original coinbase website.
Coinbase app
https://wallet.coinbase.com/
https://coinbase.com/
Downloading directly from third-party websites carries a higher risk of getting fake wallet applications, because many similar applications are created which aim to collect some of your data and serve as a phishing application. this would be very dangerous.
If an unofficial application that has not been entered in the Google Playstore, there will be a warning of Play Protect when installing it,
but there are several phishing applications that have escaped and entered the Playstore, and must be reported immediately, as said by @joniboini.
-snip- There is no need to mention the risk of downloading from a third-party source that hosts various APK, since even on the Play Store or App Store itself there are multiple malwares that are available to be downloaded directly.
For the apk downloader website that you use, usually it will only download the application in the form of an .apk file, but it must also be noted that the downloaded application is exactly the same as the application that you copied the link to in the Playstore. Several websites The downloader automatically downloads the application itself when you want to start downloading. and the most dangerous are some ads that try to download automatically with various applications that we do not know. You have to be really careful when downloading from a party website when there are lots of advertisements scattered about.