I don't know what training effect really is supposed to mean either. But I take it as the higher the number the more cardio, aerobic or anaerobic your ride must have been. Generally a good thing. Though too much of a good thing can be bad.

I just don't look at that number or the other number my Garmin gives me that tells me how long till I'll be fully recovered. I already know when I did a good ride for training effect. And if I were to wait till the time period that other number told me, then my performance will steadily drop instead of improve.

For me, not wanting to race or anything like that, I feel 3 rides a week ideal.... for me. 2 per week are okay, and sometimes I've ridden 7 days in a row. Maybe more.

Every ride shouldn't be the same effort level. Some should be easy, some hard. Rides should also be differing periods of time or miles. Some of my ride are 1.5 hours, some are 4 hours. Though for a working age person, that sometimes is an issue.

For sure in training or just wanting to get better.... doing exactly the same thing every time will leave some aspect of your fitness untouched.