If you are unable to install apps from Google Play Store on your Android phone, there can be several reasons for it. Here are a few troubleshooting tips which you can use:
Make sure you are connected to a working internet connection. It may be the reason why the apps are not downloading properly.
Check your Google Play Store app version and make sure it is up to date. If not, update it and try again.
Check if you have enough storage space on your phone. If not, delete some unwanted files and try again.
Clear cache and data of Google Play Store and Google Play services, and then try to install the app again.
Check your Google Play Store settings and make sure you have enabled the options to download apps from unknown sources.
Logout from your Google Account and login again. This may help if the issue is related to your account.
You can also try to install the app from other app stores if possible.
If nothing above works, you may need to contact Google Play Support and ask them to assist.
Hope these tips help you solve your problem.
Cheers.