In my search, I've noticed that many positions require proficiency in Yardi.I've been actively looking for effective ways to learn Yardi, but it seems challenging to find suitable training or courses online.

If you're going to run a successful business renovating houses, ultimately you being proficient at/and or managing said proficiency in estimating will be a crucial part of your underwriting.Google "how to estimate house remodeling" your hard work will be rewarded.

@Nick Rivers If you've already taken courses and webinars, then the only thing that will help you become more proficient is by actually underwriting deals on a regular basis. 

Many avenues to help you do as much or farm out parts of the deal making that you are not proficient in.  

I am proficient in investing and confident in earning 7-10% returns in the market over the next decade or two.

Become proficient in one area of the business and then expand from there.

You only get a single point of contact for everything all encompassing, and unless they are 100% competent(not even proficient) you are screwed.

As eric pointed out, someone who lives in Phila will have to be registered as a manager of the property to obtain a rental license - usually a PMPersonally if you're looking to target SFH I would recommend: Roxborough (for 3+ bedroom - there is a large saturation for 1-2 bed apartments in area), East falls, E and W Mount airy (need to be proficient in neighborhood to know where the good and not so good blocks are, and far NE philly.

Are you proficient on market research and analysis?

The issues really happen when it's just R.E. agents begging for some $, pitching "I can do that too" and in reality there in breach of NAR codes because they don't have proficiency and expertise in it what so ever.