不但 … ，而且 … (not only … but also)

Stack a second, stronger point

• Pile on a second, stronger point with not only (... but also ...)不但bù dàn … moreover而且ér qiě ….
• not only (... but also ...)不但bù dàncheap便宜pián yi，moreover而且ér qiěto be fond of eating好吃hǎo chī = "not only cheap, but also tasty."
• not only (... but also ...)不但bù dàn sets up the first; moreover而且ér qiě adds the second.

not only (... but also ...)不但bù dàn … ，moreover而且ér qiě …

• moreover而且ér qiě adds something further (and often stronger).

this这zhè(measure word)个gedish菜càinot only不但bú dàncheap便宜pián yi，but also而且ér qiětasty好吃hǎo chī。

• not only (... but also ...)不但bù dàncheap便宜pián yi，moreover而且ér qiěto be fond of eating好吃hǎo chī = "not only cheap, but also tasty."

Same subject, two points

• Both halves describe the same thing, adding a second point.

Recap

Read the full reference: HSK 3 grammar — Complex sentence patterns.