Also if you don’t start right at 6 months, it’s not the end of the world either. Not all babies have the interest. Mine didn’t, was too colicky so had to wait for that to calm down first.
Honestly it all depends on your baby, they only take a couple of spoonfuls of food at a time for the first few months and this is really a time to just experiment and see what baby likes or doesn't, they still need breastmilk or formula until at least a year old if I'm not mistaken (my first child is currently 6 years old and I'm pregnant with my second so I could be wrong). Mine likes fruit more than anything, still does, didn't care much for meats because they are usually unseasoned and bland when used for baby food (we used jars) she also liked sweet potatoes a lot and sweet peas were a sometimes and sometimes not. Most of her first 6 months of eating was fruit purees, bananas applesauce, etc. This is more of a time to experiment than it is to worry about a meal plan or "getting it right" because most of their nutrition still comes from the milk they are given
At that start baby will get all the need from breast milk or formula, so it's really about starting to have them explore and enjoy food. I have a 5yr old and a 7 month old I'm doing real food with now and for first food, mashed avocado and mashed roasted sweet potatoes were big hits ( I thinned the mashed food with water for the first few times, then worked up the normal soft food ).
Just remember to start giving your LO boiled cooled water too. Ours got really constipated when she started solids.The Solid Starts app is a pain in the ass, but useful if you can get it to actually work.
A lot of advice is outdated. So you’re reading old and new advice. Cereal rice starches, should not be first foods. Meats are typically best for their iron content. So liver pate, fish eggs, bone marrow butter, butter, meat stock from chickens and beef. Milktomeat on IG is a good resource too. But don’t worry you’re not late to introducing food. The norm is 6 months and it is a process. It’s not an instant switch, and breastmilk is still their main food source while they learn to eat.