I find poster sessions much more educational than most plenary presentations, since you can interact with the presenters.

If you would like to connect to companies, talk to the recruiters at the booths as early as possible (you still have a chance to get swag and potentially an invitation to the socials).

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The paper reviewing process is very noisy. There a decent chance your paper will get rejected. Don't take it too much to heart! It does not mean that your paper is bad, just that the process has flaws. Also: You are not the number of accepted papers in your PhD, and often quality beats quantity.

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Lastly: Talk to people! Message people in advance you might like to connect with - conferences are big these days, you rarely just run into someone that you are looking for. Also, chatting with PhD can get you some perspective (e.g. showing that the grass isn't always greener on the other side).