JMO, but you're a tad early on the LST as Perf mentioned. I would Top and FIM for now to try and grow as many bud sites as you can.
The whole idea to training is to induce shape and volume. There are excellent resources on this site that explain what Topping and FIMing are and what they do and how to do it if you aren't familiar. Shape meaning how you want it to grow in regards to the grow style you are attempting (
Sea of Green, Screen of Green, etc.) and volume in regards to how many bud sites you want to grow. In topping what you are trying to do is break the plants apical dominance, that's where the plant naturally grows in a Xmas tree shape, by cutting or "Topping" the main stem in early training. Since you are growing under artificial lighting the shape you want to achieve for maximum yield is a flat top canopy. This will afford the best light coverage to all your bud sites and give you a nice even canopy full of colas!!
You want to wait around 5th or 6th node before you start Topping and FIMing. I count around 3 nodes from the pic.
The picture below shows how my plants look after a few weeks of training. What you're looking for is a vase shaped under branch network and all bud sites relatively even at canopy line. You can achieve canopy line eveness with LST training. I would start LST training after you have branches with multiple bud sites. Since the branches usually grow straight up you can bend them over to the side to expose the bottom bud sites on the branch line to more light giving you bigger and more abundant flowers per branch. These sites will grow straight up and will give you a canopy of pure flowers!
I encourage you to continue learning about different grow methods. I like the screen of green method as that seems to yield the most flower per square foot but there are lots of other factors that help in that.
Good Luck and Welcome to The Farm!!!
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