بسم الله الرحمن الرحيم
Here’s a very, very beneficial lecture (2 parts) by Ustadh Fahad Al-Tahiri, about how one can memorise the Quran (and other texts). It’s very simple and motivating.
Ustadh Fahad originally had the class on Wiziq. It has since been converted to mp3 and transcribed, so I’ll link to all three resources.
[Note that you’ll understand after you listen to the lecture: There’s no need to print out those squares. Just get some graph paper.]
You can listen or download both parts from here.
Sayyidul Istighfar (the dua that he mentions in the lecture)