It’s temporarily lost its shine because of the slow down in transactions.

Now that they've coached me up I feel very confident using the software and closing out my books each month.

Agreed mate,I'm all about taking personal responsibility and I have been swindled many times in a similar fashion like many feel on this thread.It seems like these investors including myself in other instances get negligent and don't read between the lines.Especially after trust and a relationship have been established, we become gullible and don't second guess or question.Maybe it's greed for some but in my instance it wasn't.Just innocent and trusting stupidity (No, I'm never a victim as that is ******** mentality in my book).I had some spare $$$ and wanted to diversify in other assets through folks I considered friends and trustworthy business partners.Didn't even think twice to look things over.Looking back, it all makes sense now but it's easy being a general after the battle heheI only blame myself here...I mentioned in the thread further above that I lost to the tune of hundreds of thousands of dollars.Again, it is what it is and it's a lesson.Only myself to blame and have always taken the high road in such instances.As much as I'd like to fight for justice and go down the legal path, it just isn't worth the time and emotion.Upwards and onwards.Become better and make more than you have lost.Each to their own and that's just my personal "modus operandi"

Even then, the IRS may scrutinize the transaction if it appears the intent was to immediately convert the property into a personal residence.Additionally, if you eventually sell the property after converting it to a primary residence, you may qualify for partial benefits under the Section 121 exclusion for primary residence gains.

What other books does anyone suggest?

Old investors like me only invest in the subscription for pro; we don't buy courses or books (actually, I own probably 20 of their books) regularly.

I'll quote the book, in the section how to vet buyers from fake buyers (other wholesalers)."

I'm quite new as an investor, but with three books by Biggerpockets authors under my belt and plenty of enthusiasm, I'm ready to keep learning and to connect with like-minded people in my area and beyond.

Does anyone recommend knowledge sources on building a mobile home parks (websites, books, organizations, plans, etc..). 

These course providers tend to sell their customer base on  unrealistic expectations or teach the most basic of concepts which are easily picked up through a book or merely browsing through these forums.