Trust me, many lessons learned as of lately!!!   

On the downside, they cost a substantial amount of coin in order to get those lessons.

It stinks, because a normal person would be able to get way more than 5 years out of a carpet, but you allowed dogs to live there, and sometimes dogs pee in the house.Chalk this up to lesson learned, and cost of doing business.

We had an idea there was an issue with the septic tank, and put aside money in the budget for repairs, but didn't have it inspected until post closing (lesson learned).

Each loss is a lesson.  

Lesson learned!

Look at that - you learned a lesson without losing any money.

Lessons learned thus far:1.

I get the confusion regarding lessons from the gurus.  

For cash deals on houses you need to buy them cheap $.80 or less on the dollar for all cashWhy???