Carole Baskin Watched YouTube Tutorials for 'DWTS' Prep

Carole Baskin studied hard, and cheaply, before "Dancing With the Stars" ... picking up her ballroom basics by watching video tutorials online.

Sources close to Carole tell TMZ ... she immediately turned to YouTube for help after finding out she was going to be on the upcoming season of 'DWTS' -- and she started with the biggies: salsa, cha-cha and the Venezuelan waltz.

We're told she also enlisted the help of a cool cat ... or kitten -- one of her Big Cat Rescue members teaches dance, and gave Carole some tips.

Let's be real, she needs all the help she can get ... other than her infamous dance clip submission for the Justin Bieber and Ariana Grande music video, we're told Carole has zero dance experience.

Our sources say Carole also signed up for a virtual training app in June, with the music-based training helping her get used to being on tempo. Turns out that's important for dancing.

Carole's looking slim at 'DWTS' rehearsals ... our sources say she lost 20 lbs since shooting 'Tiger King' and is down to 165.

We're told Carole has been on a vegan diet and only eats 2 meals a day. She's also riding her bike 10 miles a day, 7 days a week, and doing a lot of squats, lunges and leaps ... and seeing results.