Learn Turkish: Hesaba kaç para gönderiyorsun? - How much money are you sending to the account?

The root word for "account" is hesap, ending in the hard consonant p. When we add the dative suffix -a (meaning "to"), the p softens to b. This is consonant mutation, which makes the word easier to pronounce: hesaba (to the account).

I thought kaç meant "how many". Why is it used here for "how much"?

You are right that kaç usually asks "how many" for countable things. However, in Turkish, money (para) is treated as countable in this specific everyday phrase, so you literally ask "how many money" (kaç para). You could also use ne kadar to mean "how much".

How is the verb gönderiyorsun built?

It starts with the verb root gönder- (send). Because it ends in a consonant, we add the helping vowel -i-, followed by the present continuous suffix -yor- (showing the action is happening right now), and finally the personal ending -sun (you). Together: gönder-i-yor-sun.

Does the verb always have to go at the end of the question?