Actual voting fraud is extremely rare on both sides. Mistakes in reporting etc. are also extremely rare.

Nominally legal but immoral methods of disenfranchising voters occur on both sides, with Republicans doing far more historically; Democrats are catching up in some ways but not others.

For instance, Democrats are now every bit as good at effectively disenfranchising voters by drawing ridiculously gerrymandered district boundaries as Republicans have been. It was a travesty when Republicans did it, and it is even more of a travesty now that Democrats do it all the time too. (Source: https://www.brookings.edu/articles/the-gerrymander-myth/) Having it balanced doesn't mean it's all cool. It is fundamentally antidemocratic.

However, Republicans still lead by a sizable margin in instituting pointless hurdles that are more easily passed by the typical likely Republican voters than by typical likely Democratic voters; this ranges from failing to provide polling stations accessible to an urban population through introducing voter ID laws without any verification that they've made IDs fully accessible to everyone successfully before the requirement goes into place. (Documentation: https://www.aclu.org/news/civil-liberties/block-the-vote-voter-suppression-in-2020)

Anyway, how about you post some verifiable facts, eh? Which precincts specifically are you talking about?