For example 1031 tax deferred exchange, BiggerPockets could teach me how to do it step by step and provide the necessary paperwork that I fill out.

It's awesome that you're taking charge of your financial literacy and setting an example for your sons.

I typically work the BRRRR strategy myselfGood Luck!

So a typical STR isn't really a hotel/motel/inn.

Any tips on finding good quality material but for a reasonable price like countertops for example, would remnant stores be a better place?

Typically if you are wanting to acquire more properties you will need to take on some debt. 

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+, zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680, some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

So, typically you as a principle have to personally guarantee the loan.

For example, Personal Consumption Expenditures (PCE), a leading indicator of inflation preferred by the Fed, was up .7% YoY in December - exceeding estimates of 2.8%.

The tax assessment is typically the first place to look.