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I use keepass (and yes, there is an android version) for my pw management. One tip I have: if a site requires a "security" question, generate the answer with keepass and store it in the notes section of that entry. Security questions are pretty stinking insecure.
There are two methods I use that might be of help to you. The first one is that I create a pattern on the keyboard. This is particularly effective for me, as a visual learner. For example, I might use “the mountain and the valley” - zse4rfvbnm. Look at your keyboard and follow the letters and you can see why I called it that. FYI, I don’t actually use that one, but just made it up to give a simple example.
The second method, and one used by many people, is to pick a line from a song, movie, whatever and use the first letter of each word. Pick a letter or two that you can remember to replace with a number (example “L” = “1” or “B” = “8”).