For us, trying to communicate with them, is as hard as it is for them to communicate with us. If a spelled word does not make sense, have the Medium in control ask the spirit if they misspelled the word. It made no sense to the people using the Ouija. I caught on, and told them to get away from the table. Be patient with the spirits, and improvise when they misspell.
Some spirits like to lie.
I find that this ratio is small compared to the ones that tell the truth, but it is something to keep in mind. I recall an incident were a spirit told the users of the board, that he was 6 years old. Stated he was born in 1954. Later in the session, he stated that he watched with his mom on the TV Nell Armstrong walking on the Moon. I did the math, and asked if he was still alive then.