Last week’s Guess The Pest challenge was pigweed (likely palmer) and ragweed. There are a lot of great weed identification resources listed at the GROWIWM.org website: https://growiwm.org/weed-identification/. Also, on their site you can find tons of great information on weed management contributed by numerous institutions and specialists including our own Drs. Mark VanGessel and Claudio Rubio.
Figure.1.Pigweed
Figure.2. Ragweed