Dove and dived are both accepted past tense forms of dive. The main difference is regional usage, not correctness.
In American English, dove is very common: He dove into the lake. In British English, dived is often preferred: She dived into the water.
That said, both forms are understood and used in many places. Style guides, teachers, and dictionaries may show a preference, but neither form is wrong in standard English.
- Present: I dive every summer.
- Past: Yesterday, I dove into the pool.
- Past: Yesterday, I dived into the pool.
- Past participle: I have dived before.
A useful tip: if you are writing for an American audience, dove will usually sound more natural. For British audiences, dived may fit better. Choose one that matches your audience and stay consistent.