What is called Bitcoin core today it's former name was Bitcoin-Qt. Managed to forgot my password for my first encrypted wallet, I spent one weekend trying to test all combinations around 2011, The issue was my frequency on typing the password was so high that two letter could swap and if I concentrated to write it correct it would become in the correct order but could some times fail when my mussle memory just made the dance on the keyboard.

Don't remember exactly year but started using the Bitcoin wallet on android by Schildbach which I used in Berlin to buy beer and burgers at Room 77. And also went with Myceliym which was early with Hierarchical Deterministic addresses.

Was doing some reckless stuff with blockchain.info wallets where your wallet was the id in the URL, but it was convenient.