Can any one recommend any sites or articles which can provide some depth into rental insurance. 

I just posted an article on UBIT here on BP.

There are plenty more resources you can find under Education from how to's, blogs from our experts and podcasts.

Between the podcasts, forums, and blogs theres more information than you could possibly take in a year.I have a suggestion though...if you like learning from books, pick up the Millionaire Real Estate Investor by Gary Keller.

@Matthew RembishHi MatthewI use irem.org for management companieswww.spotcrime.com for crime in a citybls.gov for demographicshud.govfamilywatchdog.us for registered sex offenders in a citywww.propertymanagementinsider.com for good articlesCheck out @mark ferguson blog.  

Have you gotten a chance to check out the BiggerPockets blog or podcast?

Be sure to check out the podcasts and blogs as well as the forums.

I've read an article that mentioned that when we do lease option, we can make money from the "option money" from when they move-in to the house.  

I recently read this article: https://www.biggerpockets.com/renewsblog/2009/03/25/series-llcs-real-estate-investing-primer-leap which you may also find helpful.

@Elizabeth Colegrove amazing blog you have.