Nihongo ga o jōzu desu ne

Is the 'o' before jozu honorific ? ga makes nihongo the subject of desu . But what is the o for ? Thanks !

it's simply a honorific particle which you put before a word to make it, well...honorific :). There is also Go as an honorific particle, but that's covered in later lessons. examples: Osushi ga suki desu -> I like sushi -> honorific "o" GOmeiwaku o okakeshite gomen nasai -> I'm sorry for causing you trouble/inconveniences -> honorific "go"

はじめまして。

私はすしがすきくないです。

Amitさん、 こんにちは。 In your last sentence it should be: わたしは　すしが好きじゃないです。 好き　is a　な adjective so when making it a negative we add じゃない。 E.g.　きれい＝　きれいじゃない 日本語の勉強　頑張ってください！