1) Webinars: Now before some of you howl in protest, let me explain. Yes, some of the free webinars offered don't amount to much more than a sales pitch. But some of them offer nuggets of helpful wisdom. As long as you expect there to be a sales pitch at the end, it's not such a blow when the host asks the instructor, "What great deal are you offering us today?"
The most informative (but not free) webinar I attended was WordPress at 10,000 Feet. It was invaluable and worth every penny, especially since I tried to set up a website on my own before and failed spectacularly. Some free helpful webinars I've taken have been on topics like "Heart" Sell vs. Hard Sell, Marketing Strategies for Pinterest, Double Your Social Media Traffic, and Why You Suck at E-mail (& How to Fix It).
2) Books on the craft: If your time isn't flexible and your employer frowns on you using company time to attend webinars, books on the writing craft might be a better fit. There are many good ones out there covering a variety of topics (Sell Your Book Like Wildfire by Rob Eager, Proofreading Secrets of Best-Selling Authors by Kathy Ide, Self-Editing for Fiction Writers by Renni Browne and Dave King--which many authors swear by, although I didn't care for it). I try to read a couple a year, mixed in with all my fiction choices. Pick up a few or request them from your local library.
3) Conferences: This is the most expensive option out there, even if it's just a one-day workshop. If you can handle the finances for one or two a year, then definitely spend the money. Find a conference covering interesting topics with agents, editors, and publishers who are interested in your genre. Then start saving. I've attended one-day workshops and three-day conferences, and it's always been worth it. This year, I'm saving my pennies for Realm Makers in Reno, Nevada, the perfect choice for all speculative writers (plus the people there are truly kind, cool, and talented individuals).
So keep writing, reading, and listening. And never stop learning.