Don't worry about it - many games that use an autosave feature give a warning like this, even if it's just saved the game. You can read it as 'make sure you hit a checkpoint before you quit, otherwise you'll lose everything you've done since the last one'.

As long as you quit after hitting a checkpoint your progress will be saved.

Lego Star Wars - The Complete Saga: How do I save the game?
Hi,

I have a question that I've been thinking about for a long time.

How can you assure yourself that you've fully comprehended a concept or the true meaning of a theorem in mathematics?

I mean how can you realize that you totally get the concept and it's time to move on to the next pages of the book you're reading?

Thanks in advance for your responses.
