〜に加えて
in addition to, as well as
Noun + に加えて / に加え
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に加えて adds one thing to another: 雨に加えて、風も強くなってきた, "on top of the rain, the wind has picked up". 加える means "to add".
It follows a noun, and the second half usually has も. It's neutral and a little formal, common in news, explanations and business: 授業料に加えて、教科書代もかかる, "in addition to tuition, there are textbook costs".
In formal writing, it's に加え. At the start of a sentence, それに加えて means "in addition".
Compare 上に, which joins whole clauses of the same kind, and はもちろん, which treats the first item as obvious.
Examples
雨に加えて、風も強くなってきた。
On top of the rain, the wind has picked up too.
授業料に加えて、教科書代もかかる。
In addition to tuition, there's the cost of textbooks.
日本語に加えて、韓国語も勉強している。
I'm studying Korean as well as Japanese.
経験に加え、資格も必要だ。
Qualifications are needed in addition to experience.
仕事の忙しさに加えて、家のこともある。
On top of being busy at work, I've got things to deal with at home.