If you're not getting it already, I highly recommend the Gardens Alive catalog. https://www.gardensalive.com/catalog_request_qas.asp It's packed with photo ID's of insect pests and plants diseases (and of course which of their products are good for what) -- very useful even if you don't buy anything from them. The latest one came with $25 off $50 or more order coupon. (They do this every quarter or so. Sometimes with no minimum.)
Another catalog that I find useful is Johnny's Selected Seeds -- great for detailed seed germination info e.g. ideal germination temp and growing temp, and days to harvest for most flowers as well as vegs. Same info is also available on their website: https://www.johnnyseeds.com/ I usually buy a good percentage of my seeds from them.
Any other useful free info sources?