As an early grower, what do you feel was the best advice and worst advice ever given to you.
Ill kick it off.
Best advice would have to be, to not go cheap on testing devices. Which quickly became apparent once my grows progressed.
And worst advice is really hard to pinpoint. Pretty much any broscience rabbit hole i went down in search of the truth. Which isnt really bad advice as much as a bad experience.
Best advice:
âyou should grow its funâ
Worst advice:
âDont worry about it, the set up isnt that expensiveâ
Worst advice : Autos are for beginners.
Best advice :. Buy it right, buy it once.
Stem splitting, ice baths, extended darkness etc.
Worst advice: Not to me but I was in a thread where I saw the OP state âYou cannot grow good weed without worm castingsâ
Best advice: Bro - just grow your own, itâs fun
Worst advice: donât worry about telling [the wife] before buying the gear and seeds for the first grow, she wonât care.
Best - you know what your actually getting
Worst - itâs cheap and easy 
Best: Patience
Worst: I have to agree with the bro/pseudo science.
Best advice, âGet yourself a quality grow light fixture!â That came from @Graysin and @dbrn32 - THANK YOU FOR THAT, I thought the one I had would work, while it would grow cannabis, not anything worthy of paying an electric bill for.
Worst advice, mostly stuff I know Iâm not going to venture into. I try to take everything at face value, never know what you might learn from someone.
Best advice
When I was laying out the walls for the expanded grow space I told my wife that it wasnât functioning how I wanted it to. Her response was " will making it bigger solve the problem". The extra couple of feet made all the difference.
Listening to myself. When first started I thought - what do I need a ph pen for. Why do a need a TDS meter.
Great topic question !!! 
Best advice:
Water heavily but only when the plant is almost wilting⌠at 6.5 pH.
Worst advice:
Autos are the easiest to grow so brand new growers should only grow autos.