It’s not a big amount but what should I do with $800? Keep in my bank or invest in a robo-advisor? If robo-advisor, which would you recommend and what portfolio?

Have you set aside some emergency funds in case you need to use? If no then keep this as the emergency funds, if yes then consider syfe equity 100

Is this $800 spare cash which you wont need for short term needs?

if yes put in syfe equity100

if u are just parking it somewhere and wants to take it out in a few months, put in singlife or syfe cash+