....whether you take any notice of odds. Also, online poker doesn't seem to pay any attention to odds or probability (as we know them), so a knowledge of them here is not vital.

If a player flops 2 pair, and another an open str8 draw, it is unlikely at the lower levels of online poker thet the str8 draw will fold whatever the bet size. Many times I have suspected an opponent has it, so have moved all in to irradicate the odds for him/her to call. They call anyway, so a knowledge of odds actually costs me money.

Maybe at higher levels, players will take more notice due to the higher amounts of money involved, but play low level online poker and odds mean absolutley nothing.
Online, I have over 200k in hand history, and AK is evens with Ax (preflop odds are about 70% in favor of AK), and mid pocket pairs are only slightly behind higher pocket pairs in odds (the higher pair should be about 80% favouite). Hence my comment that odds mean nohing online.

My opinion is to learn them, as if you want to improve as a player, it is an added advantage over other players.