Yellow spots on edge of the plant is typically overfeed issue.. hard to say for sure without your feed schedule and more info about your grow. This site you upload your information once a week and it helps track your grow. When uploading the data it is important to add nutrients, feed strength, lighting.. all the important stats in a grow. You can enter contests by answering grow questions (like this one!) or going to the contests tab and entering single strain diaries. There are representatives from top seed banks that will check in on your grows, comment and even send you free seeds! There is so much this site has to offer. Tons of research available from people who grew the same strains,,, see people do crazy grow techniques and overall it is a pretty positive community. Welcome! 👊