First of all VS says it doesn’t have a Post type, and underlines it:

Second thing, according to manual, you have to use method as a parameter, and you have to use download and upload handlers:
Third thing, all the other docs and answers around still use it as .Post().
Can someone tell me a correct up to date alternative to that:
UnityWebRequest www = new UnityWebRequest.Post("http://url.com", formData);
with those download and uploadhandlers
public UnityWebRequest(Uri uri, string method, Networking.DownloadHandler downloadHandler, Networking.UploadHandler uploadHandler);
Thanks!