This September I'll be taking classes to begin the process of getting my Real Estate license, my plan is keep my day job to keep getting my active income, but do real estate on the side to make extra money for investing.

Customer isnt happy , the extra costs to do the footer was an additional charge ( as per contract ) And the finish date extended ( as per contract ) .  

That gives you 60 extra weekdays to get up to speed on stuff that requires a lot of uninterrupted brain power.

Be extra careful that what you're seeing here is in fact what is going on!

One of their contractors requested an extra $100k.

that is a lot of bathrooms to clean and if you have a maid an extra expense.

Would you take the guarantee or go for the extra $100 a month? 

No Drywall or wood that can mold no Carpet only hard solid surfaces. rated for 90% of Noth America with an emergency ADU permit from Ipermits USA to add your existing single-family properties when you wish to generate extra rent.

I'm thinking you could do it if you were to lease the extra beds in your primary, plus your existing rental, plus a 600-700k luxury airbnb (10% down second home loan), plus an additional luxury airbnb purchased with conventional financing (20% down) and using the same operating systems as the first purchase.

Of course, if you think you're going to spend that extra money on "hookers and blow", as my friend @Jim K. would say, then you should probably leave it in the property.