Some sites (this one) insist that you upload/share a certain 'ratio' of what you download or you pay 'penalties'. Most good sites will talk you through maintaining a decent ratio before taking away any privileges.

As Uwe said a good way to get a decent ratio is to download 'freeleech' torrents as you will get full credit for what you share.

Two other ways are just leave your torrent client open with the torrent you have downloaded after it is complete - any share after will be a credit to your ratio.. or the ultimate way is to post your own torrent  :cheers:

With that you get full credit for the upload but no download amount (because you didn't download anything)

And  :welcome:

In short, it is the amount of data you upload divided by the amount of data you download.

You can read more there > https://www.gaytor.rent/rationator.php

and if you want to be sure to start well, download Freeleech torrents you like and have enough freeleech time left to complete your download. The download doesn't count while a torrent is freeleech, but the upload does.