无非 + 是/就是 + Explanation
无非 means "nothing but" or "merely," used to reduce something to its simplest essence. It implies that there are no other possibilities beyond what is stated, often with a dismissive or matter-of-fact tone. For example, 无非就是想省钱 means "it's nothing but wanting to save money."
他每天做的无非就是上班、吃饭、睡觉。
Tā měitiān zuò de wúfēi jiùshì shàngbān, chīfàn, shuìjiào.
What he does every day is nothing more than going to work, eating, and sleeping.
她生气无非是因为你忘了她的生日。
Tā shēngqì wúfēi shì yīnwèi nǐ wàng le tā de shēngrì.
The reason she's angry is simply that you forgot her birthday.
这道菜无非就是加了点辣椒,没什么特别的。
Zhè dào cài wúfēi jiùshì jiā le diǎn làjiāo, méi shénme tèbié de.
This dish is nothing special; it just has a bit of chili added.