Four years ago, even before the polls closed, we were bombarded with false and misleading claims of election irregularities and fraud. Most of it was obvious (to experts in elections) BS - vote-flipping satellites and the like - but it was exhausting to deal with from sheer volume. And it convinced enough people that we had a literal insurrection attempt.
This year I expect at least the same volume of disinformation, but that it will be of better quality and less obvious.
Be ready.