Baby food help

I’ve been giving my 7 month old different types of frozen vegetables potatoes, porridge cereal and fruit purees. I’m a first time mum and I had to teach things myself so the other day I found out that giving your baby frozen vegetables and boiling them aren’t the best? Now I feel bad and. Don’t know how I should cook her food exactly and what else to feed her so please give me suggestions of foods and how to make them thank you