In addition many CA cities have big anti STR sentiment.  

Great addition!

Or anyone target these types of properties in the Phoenix marketplace who is looking for additional deal flow?

If you sign up and never attend any of the classes/discussions, then you won't gain value.

Some search results have said a liability waiver/addendum signed by the tenants is enough , while others say I need an additional gate just to the pool area.

If you can definitively prove that the seller intended to deceive you about the square footage for their personal gain, you may be able to take legal action, but probably low chance of success considering you had ample opportunity to measure the home or get an appraisal with measurements prior to closing, and had your chance to negotiate the price based on square footage and all other factors prior to closing. 

I have additional documentation for renters and owners to follow, but that’s a separate conversation from my post.

Hey there, just got a quick question,Im 21 and in school looking to get into real estate investing but would love to gain some real experience, are there any options to get experience online?

Even then I would really run the numbers to see if it makes sense since there are additional costs (utilities, internet, etc.)2.

Option 2 entails exploring refinancing possibilities with other lenders offering BRRRR-friendly mortgages without such clauses, albeit with potential additional costs.