[HACKERS] Toast,bytea, Text -blob all confusing

I'm trying my best to convert from MySQL to PgSQL but I cant get a good answer about certian questions. It was an easy task in mysql but all this talk about , text , toast and bytea is just confusing me. I cant get a clear picture of any of this,from the book from Bruce, the e-mail archives. Ive

[HACKERS] Toast, Text, blob bytea Huh?

I'm trying my best to convert from MySQL to PgSQL but I cant get a good clear answer about certian issures.Mainly TEXT, TOAST,BLOB , BYTEA etc. It was an easy task in mysql but everything in the archives about , text , toast and bytea is just confusing me with postgresql. I have Bruces's book an