Do you have any recommendation or tips on how to study the Quran and it’s tafseer? How can one completely memorize the Quran and it’s true meaning?

In order to memorize the Qur’an, you need to read it correctly first, and this is done through one of two ways:
1- Being a student at the hands of a Sheikh Hafez and reciter of the Qur’an.
2- To follow some computer programs designed to memorize the Qur’an.
As for tafsir, it must be studied by a scholar specialized in the science of tafsir, and it cannot be learned like this.