Arduino Mini programming with Uno

Can I program an Arduino Mini with my Arduino Uno TX/RX Output or do I have to use an Arduino USB-to-Serial-Converter? I have an Uno, a Mega 2560 and I want to buy a Mini, so do I have to look for a converter or can I use my Arduinos? If I can do that with my Arduinos, what do I have to do? Only connect the RX/TX to the Mini and Upload the Sketch? Thanks for helping :) (Sry if this is a stupid question, I'm new here)

If you connect the reset pin to ground on your Arduino Uno, it will be like a USB - serial converter, and you can use it to program your Mini