A mixture of both is probably the best. I would definitely read up on the theories and then you can decide which ones to add to your repertoire. You always have a certain artistic freedom in poker. There is not only one successful way. Depending on the strengths of a player, this can also differ significantly. It is often argued that playing according to fixed tables becomes static and suboptimal Strategy leads. That's true, of course, but only if the charts are followed too strictly. However, if you use tables sensibly and flexibly, they can bring many advantages. Primarily they give you a starting point for your considerations. It's easier yourself in difficult situations to consider how and why you should deviate from your standard range instead of completely without it Clue to reinvent the wheel.