If you are just looking for some resources to get started straight away for free, I post guided meditation recordings on my YouTube channel (I recommend starting with the Shamatha playlist). I’ve also put a lot of my writings and guided meditation recordings on the Sit Down and Practice Resource Hub.
For a self-paced online course: Sit Down and Practice is a completely free 42-day video course to establish a meditation practice with daily reminders, guided meditations, and resources.