It will be easy for you to check if they paid on time, as you can check instantly online.  

Networking, local meetups, door knocking, mailers, wholesalers, online forums specific to your area of interest.  

Quote from @Zach Howard: Quote from @Jonathan Greene: If you are looking at properties in the US only on Zillow, and not seeing them in person (I know you are in Hong Kong), this is just an effort in futility because you can't underwrite single-family or small multifamily deals only online.

I also recommend a bank that has local branch that you can go into vs having it 100% online.

Unfortunately, while all the online places area great sources of information, you are much less likely to take action, or find someone to shadow, when online in a forum. 

Propelio is especially popular in Texas, so if you're investing in areas like Dallas, Fort Worth, Plano, or Frisco, it’s worth exploring.Public Property Records: County appraisal districts (CADs) often have free online tools to search properties by owner name or address.

Since the last time I was online, I have grown the investing to fix and flipping and a portfolio of 4 properties that are producing passive income.  

I know this is a differing topic on the forums, and online in general, but having the legal background/education and knowing estate planning concepts you'll realize it shouldn't be.  

Definitely online via property management software!

it is already the 6th day of the month, and most of our tenants made the on time rental payment on the 1st.we am copying our attorney soon and will report to the police department for lost $49,987.00 tenant rental income.So far we have called your customer services and online chat but nobody is answering.