How do I install digital wallet on my phone?

Can you please elaborate on the steps I need to follow to successfully install a digital wallet on my smartphone? Are there any specific requirements or compatibility issues I should be aware of before proceeding? Also, are there different types of digital wallets available, and if so, how do I choose the one that best suits my needs? Finally, are there any security measures I should take once the wallet is installed to ensure the safety of my digital assets?