As you mentioned, internet gurus (and just about every source you’ll find) are all over the place with training programs and schedules. I’ve tried just about everything out there and what I’ve found is success is largely personal - what works for some, works for many...but not everybody.
What has worked for me is one weekly long run at a comfortable talking pace (I ignore HR for this), a couple moderately paced tempo runs, and two speed days. If your goal is a 10K, the speed days consist of half mile intervals 15-20 seconds per mile faster than race pace goal. If your goal is a half marathon, the interval distance is a mile. Start with four intervals and increase depending on your motivation to 6-8. The other days are rest or easy rest like walking, swimming, or easy jogging.