This post was automatically generated by WordPress when I set up this site on the day as stated below the post title. I intentionally keep this post visible to remind me the reason why I run this site, which is to collect all my notes when I learnt something new. Indeed, I can put all my notes in the Evernote or something similar with. However, I believe by sharing these notes, the one who reads the notes in this site can also take advantages from the content s/he reads.