At what age did you start introducing solids?

At what age did you start introducing solids? What brands were given for baby food, like Fruto Nanny? We first give 2 tablespoons of broccoli after feeding the child on infant formula completely, the next day, already 2 tablespoons and so we add 1 tablespoon every day for 10 days, and so all vegetables, then all cereals, meat, fish. Did I write it correctly? At 8 months, do you give pieces? Then how do you feed them after introducing these foods? We gradually reduce the portion of infant formula.