✨ ベストアンサー ✨
I hear that Our ALT (has) taught himself to speak Japanese using the internet.
teach onself to 〜 〜のやり方を独学する
I was impressed by the beauty of photo(s) on my friend's website.
もしくは
I was impressed with how beautiful the photo(s) of my friend's website.
何時間もかじりついている⇒何時間も費やしている
My mother thinks I spend hours playing computer games.
ありがとうございます!!