I am having a hard time to download apps

See if anything here helps.

Apps won’t downloaded.       

App Store, iTunes Store, or other Apple services - If you can't connect

Some other things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch         

Try a forced restart.

Reset Device.      

If necessary

Hard reset.        

Do a backup and try a factory reset. Then restore from your backup.

Restore to Factory setting.      

Backup - Restore your device from an iCloud or iTunes backup.      

Why can't you download them, what happens ? What have you tried ?