Someone I know was the Condo president all new to him and they asked him to sign documents in regards to moneys without any back up of where and why the money was spent for the Condo, is this the norm? thanking you

That's a very specific question that needs more details to be answered

whoever sign any paper/document should know what they are signing. And president has more responsibilities than an ordinary person.

Every person should understand what they are signing PRIOR to placing a signature on any documentation. If unsure, consult a lawyer.

You should always get legal advice when signing paper work or a contract, especially if you are unsure of what you are signing. Plus get a copy of what your signing. Hopefully the person who signed has a copy and take it to your lawyer if you have concerns.

If you are responsible for something you should sign it only knowing what you are signing for.
BTW,
Who is "they asked him to sign"?