The recommendation is 6 months for starting solids however there is also a school of thought that introducing the highly allergenic foods between 4 and 7 months reduces allergies. This threw me when Liz Hallam our pediatrician from Flourish Pediatrics told me about it. I think there might be info on her website.
We do BLW with some spoon feeding and follow DD's cues. She was interested early so we gave her a few tiny tastes. We introduces the top 8 highly allergenic foods between 6&7 months as recommended so we were covering all bases.
We also want DD to have a broad pallet so we have given her a huge range of foods- from goats cheese to cumin, lentils, rare beef, tofu... You name it if we've got it in the house( apart from honey) or on our plates at a restaurant we give her some.
It's important to wait until your LO is showing signs of being interested. And for ages it's more about tasting and learning than actually eating and swallowing.