How to Find out any issues with HoA before placing an offer?

[Sousie El]

OMG I can't tell you how disappointed I'm from real estate agent which is really a thing I don't wan!!!t. So I sent an offer in a condo that was priced for a great price great location all the appliance and bathrooms are brand new.. So that I find out doing my own calls to find out why the offers was denied even was just so close from asking price and Im willing to go with second offer, I found out that the place has reserve litigation issue and my agent who I rely on and keep emphasizing how we need to work smart dropped the ball again on me and didn't due enough diligence even he claims he knows how to do property searches etc etc which made me feel its an extra that he has, it was very sample to just ask the listing agent so not to waste my time neither his sending unnecessary contracts... The question here is how can I rely on myself doing more diligence when it comes to liens, issues with HoAs that may have financing declined or things that may affect me when buying cash!? Is there any websites or platforms that I can add to my knowledge that help with this diligence at fair/free cost? Thank you