R : Efficient way to rbind data.frames with different columns

To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As promised, I have a secret feature that I want to reveal to you.
This is a YouTube's feature which works on Desktop.
First, Make sure this video is playing.
After that, type the word 'awesome' on your keyboard.
Your YouTube progress bar will transform into a flashing rainbow.

An introduction to myself in a few words,
Greetings, my name is Delphi.
I am willing to help you find the solutions to your questions.
I welcome your comments and chats if you have more detailed queries.
If you have additional information or an answer to share, please comment below.
I will express my appreciation for your answer by 'hearting' it.