Recommended · for beginners
Programming an ATtiny85/45 with an Arduino UNO (Getting started)
Why people recommend it
A step-by-step guide to programming an ATtiny85 with an Arduino acting as the programmer, repeatedly offered to people getting started with the chip.
Watch for: Bootloader section can be skipped if using avrdude directly
In their words
I would suggest you to take a look at this video which explains step by step how to program the ATtiny85.
Shaam on arduino.stackexchange.com, Jun 2018. CC BY-SA.