Agree with all the posts above.
I consider myself fairly intelligent (I am sure we all do) but most of the time poker strategy is presented in a manner which does not engage me. Either written or in video format.
It used to frustrate me but then I realized with the formats (again written or video) most of the authors/presenters did not come from an education background where they were used to writing/presenting in an engaging manner. They came from a poker/
gambling background and often the coaching can appear dry and uninspiring. Well, that's the case for me and I do not believe it a question of intelligence.
So, for a long time I have not worried if I feel I have not completely grasped a specific strategy. I'll do a casual fly past...then maybe revisit later and try to get a better handle on something. I believe we all learn at our own speed and trying to shoe-horn poker theory into 'I am going to apply myself and learn it' is a non-starter.
The fundamentals are still the fundamentals. If you understand how and what you should be playing in terms of hands and table position, just play and your understanding will grow. Then, when you do apply yourself to study don't worry about some concepts appearing baffling.
It is easy to slip into the mode that most are playing sophisticated poker. I do not believe they are. More often than not it is about aggression shown in specific spots, which is very effective but not that nuanced.
Just relax and understand some are naturally drawn to the mathematical and statistical side to poker and others are not. But that does not mean that those who play intuitively cannot succeed.