I want to become really good at analyzing deals, and determine the markets I should focus on.Are there any resources aside from this forum (books, journals, news publications, podcasts) that you recommend I use to learn more?

Focusing on homes that area ideally under 1500 sq ft. 

I am currently based in Canada and am looking to embark on my real estate investment journey in the United States, specifically focusing on multifamily properties. 

@Jon D. some questions, the answers may help you better focus.1) Why did you pay your primary mortgage off in the first place?

Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little, maybe even negative, relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560 (almost 30% probability of default), little to no good tradelines, lots of collections & chargeoffs, recent evictions.

Also, focus on 2 years of job/income stability.Class D Properties:Cashflow vs Appreciation: Typically, all cashflow with little, maybe even negative, relative rent & value appreciationVacancy Est: 20%+ should be used to cover nonpayment, evictions & damages.Tenant Pool: majority will have FICO scores under 560 (almost 30% probability of default), little to no good tradelines, lots of collections & chargeoffs, recent evictions.

., when looking at small towns, focus on markets with strong rental demand—whether from visitors, local workers, or a growing economy.

Is there anything specific I should focus on during the due diligence process, particularly regarding title and document inspection, compared to a traditional sale?

I would focus on OKC for the best bang for your buck.

Focus on attracting midterm renters through platforms like Furnished Finder, especially during slower periods.