The only suggestion i would add if you're going to do a 'Free' link, was you could possibly make it a link to download the grow guide as a free mini-book in PDF format, as potentially people will engage with it for longer as a standalone document, rather than just clicking straight back to posting a question on the forum.
Otherwise, and i don't know if it's easily possible, my only other suggestion is regarding people who do post help questions & to get around the issue where alot of initial responders end up having to ask for further details about set-up, etc before actual answer can be given.
You could instead design a special 'Help' template for new posts in Help Section where underneath the post they have to fill out a checklist form on set-up details such as Light, Temps, RH, pH, Feeds Used, Soil Type, Pot Size, Tent Size, etc, etc, and enable it so it can't be posted without it being completed. Making multiple pic attachments mandatory before posting could be viable too. That way it would save abit of time for the people kindly responding, and people would more inclined to answer something with the facts already correctly laid out in front of them. Also possibly then the rest of the forum posting outside the Help Section could be more of a 'Lounge' or General Discussion area, and any incorrect help questions found outside Help Section get deleted with a referral message to complete the Help template instead. I appreciate this would be alot of work rejigging the whole site so might be abit too far.