Hi K.,
You're right. There's a lot of "advice" out there, and much of it conflicting. If your baby is continuing to grow and has healthy "output" (poop & pee), you have nothing to worry about.
I can share with you how my son's feeding habits changed as he grew. For liquids, he had both formula and breastmilk until he was 6 months, then I stopped breastfeeding. From 6 months to 10 months he drank formula, and at 10 months we switched over to goat and soy milk. (He can't tolerate cow's milk.)
Around 4-5 months, we gave him oatmeal and bananas. Other first foods he had included: apricots, pears, peaches, peas, sweet potatoes, and green beans. We hardly ever bought commercial baby food. Mostly we would just buy canned fruits & veggies and pureed them ourselves.
He was late to get teeth (10 months), so his diet was pureed foods for a good 5-6 months. It seemed like an eternity, and I got some flack from others for not giving him a broader diet. I stood my ground--he didn't have teeth, how could he eat anything else?
When two teeth finally came in, his eating habits changed overnight. At 11 months old, he now eats whatever we're eating. I just chop or cut up our food, and then he feeds himself. I still feed him applesauce and other runny stuff with a spoon, but he can eat hotdishes, meats, noodles, etc., all by himself.
Sorry for the long post, but I hope you'll get something out of it. Good luck to you, and trust your instincts!