Learn Hardcore Filipino: Magkita tayo sa istasyon kung umuulan, at dalhin mo ang payong. - Let us meet at the station if it is raining, and bring the umbrella.

Magkita is mag- + root kita “to see each other/meet.” It’s reciprocal: both parties are involved.
Magkita tayo literally means “let’s meet (each other),” with tayo = “we (including you).” It’s a suggestion/hortative, similar to “Let’s meet.”

Is the kita in magkita the same as the pronoun kita (“I you”)?

No. There are two different items that look the same:

In magkita, kita is the verb root “see each other.”
The pronoun kita is a clitic meaning “I [verb] you,” as in Nakita kita “I saw you.”
Compare:
Magkita tayo bukas. (Let’s meet tomorrow.)
Nakita kita kahapon. (I saw you yesterday.)

Why use tayo and not kami?

tayo = we (inclusive: includes the listener) → appropriate for “let’s meet.”
kami = we (exclusive: excludes the listener).
Saying Magkita kami sa istasyon means “We (not including you) will meet at the station.”

Can I just say Kita tayo sa istasyon?

Yes. In casual speech, people drop mag- and say Kita tayo to mean “Let’s meet.” The full form Magkita tayo is neutral and a bit more formal/clear.

Should it be kung umuulan or kung uulan? What about kapag/pag?

kung = “if” (conditional, uncertain).
kapag/pag = “when/whenever” (temporal, expected or habitual).
Aspect:
uulan (contemplated/future): “if it rains (later).”
umuulan (imperfective): “if it is raining (at that time)/whenever it’s raining.”
For a future plan, the most common is: Kung uulan, …
For a general rule: Kapag/Pag umuulan, …

Does the “if” part apply to both actions? Is the comma before at okay?

As written—Magkita tayo sa istasyon kung umuulan, at dalhin mo ang payong.—it’s a bit ambiguous: the umbrella command could be read as unconditional. Clearer:

Kung uulan, magkita tayo sa istasyon at dalhin mo ang payong. (The condition covers both.)
Or: Magkita tayo sa istasyon kung uulan. Dalhin mo rin ang payong. (Two sentences.)
You normally don’t need a comma before at.

Why is it dalhin and not magdala or dala?

They’re related but not interchangeable:

Dalhin mo ang payong. Object-focus (patient-focus). “Bring the umbrella (to/with you).” The umbrella is definite/specific.
Magdala ka ng payong. Actor-focus. “Bring an umbrella.” Indefinite “an.”
Dala mo ang payong. Stative/possessive sense. “You have the umbrella (with you).”
If you want to specify destination: Dalhin mo ang payong sa istasyon.

Why is it mo and not ka in Dalhin mo ang payong?

In object-focus verbs (like dalhin), the doer is marked by a genitive pronoun:

mo (you), ko (I), niya (he/she).
In actor-focus verbs (like magdala), the doer is a nominative pronoun:
ka/ikaw, ako, siya.
Compare:
Dalhin mo ang payong. (OF → agent = mo)
Magdala ka ng payong. (AF → agent = ka)

Why ang payong and not ng payong?

ang payong = the umbrella (specific/known), and in object-focus it’s the grammatical pivot.
ng payong = an umbrella (indefinite/non-specific).
So:
Dalhin mo ang payong. (Bring the umbrella.)
Magdala ka ng payong. (Bring an umbrella.)

Can I move sa istasyon or the kung clause around?

Yes. Tagalog allows flexible order for focus/emphasis:

Kung uulan, magkita tayo sa istasyon.
Sa istasyon tayo magkita kung uulan.
Magkita tayo sa istasyon kung uulan.
Clitics (e.g., na, rin/din, po) follow the first prosodic word of the clause.

Is istasyon the usual word? I’ve seen estasyon.

Both occur. istasyon is widely accepted in modern spelling; you’ll also see estasyon and even stasyon in some materials. If you need to be specific: istasyon ng tren (train station), istasyon ng bus (bus station).

How do I make the sentence more polite or formal?

Add po/ho (politeness particle): Magkita po tayo sa istasyon… Dalhin mo po ang payong.
Use plural/respectful second person: Dalhin ninyo po ang payong.
Use paki- to soften the request: Pakidala ang payong. or Pakidala po ang payong.

How do I say “also bring the umbrella”?

Add rin/din after the first prosodic word of the clause:

Dalhin mo rin ang payong.
(Use din after a vowel or n; rin after most consonants. Many speakers use them interchangeably.)

Any quick pronunciation tips for tricky parts?

magkita: stress on KI → mag-KI-ta.
umuulan/uulan: there’s a vowel sequence u-u; stress typically on the last syllable → u-mu-u-LAN / u-u-LAN.
dalhin: an inserted h; stress on the last syllable → dal-HIN.
payong: PA-yong (ng = [ŋ], “ng” as in “sing”).