英语语法高手请进Through an advertisement you can learn what product

Through an advertisement 是方式状语
you：主语
can learn ：谓语
what product you need is avaliable,where to buy it and how much it costs.：并列宾语.其中what product you need is avaliable和how much it costs是宾语从句,where to buy it是疑问副词+不定式结构,但不是宾语从句（当然,如果改为where you can buy it才是宾语从句）；you need 是定语从句,修饰product

Through an advertisement 方式状语
you can learn
主谓
what product you need is avaliable，where to buy it ，and how much it costs
3个宾语从句

Through an advertisement做状语，意思是通过广告
you can learn 是句子主干，后面一串都是宾语从句
宾语从句共有3个小句，之间是并列关系。what product you need is avaliable【1】，where to buy it 【2】，and how much it costs【3】.

Through an advertisement是状语，an advertisement是throught的介词宾语
you can learn 主谓
what product you need is avaliable 第一个宾语从句，其中you need是句子作插入语
where to buy it 第二个宾语从句
how much it costs 第三格宾语从句