In Tagalog, you say "Hello" as:

• "Kamusta" (pronounced kah-moo-stah) — This is the most common way to say "Hello" or "How are you?" in a friendly, informal way.
• You can also say "Kumusta" , which is a variant spelling but pronounced the same.

For a more formal greeting, you might say:

• "Magandang araw" — meaning "Good day."
• "Magandang umaga" — meaning "Good morning."
• "Magandang hapon" — meaning "Good afternoon."
• "Magandang gabi" — meaning "Good evening."

So, the simplest and most common way to say hello in Tagalog is "Kamusta!"