Below is a resource that may be of value to you in understanding the framework of meditation. Even just the first few minutes of this audio recording will be of value in grounding any application of Mindfulness training. It is an excellent resource for a summary of the way the Path works.
https://bodhimonastery.org/the-buddhas-teaching-as-it-is.html
I only found this when looking at another resource given here.
Note that this teaching was given in 1981 
It makes me contemplate that In our unrelenting fever for new things, it is easy to overlook some absolute treasures… lol same goes for general development of Buddhism (and the modern mindfulness movements), the EBT’s are the gold,. The quest for ever new, somehow thinking that just because it is new it is better, has the capacity to lead people down the wrong track. Just because it is newer, doesn’t mean that it is an improvement.