What medicinal herbs do you recommend beginners start with?

The number 1 herb FOR WOUNDS that I have found in 40 + years of study is COMFREY( comfrey oficialious)..... it is in a league of its own... however it doesn't fight infection.  The number 1 herb for infection that i have ever found is WORMWOOD.... (artimiesia abstanthia) combined together these will heal things at an unbelievable rate.... DO NOT APPLY DIRECTLY TO PUNTCHURE WOUNDS as it will seal the skin and leave a pocket... taken internally a 00 capsule given 3 times in 24 hours will cure parvo in puppys... I take a capsule for stomach issues... but not on a regular basis as it builds up and can harm your liver.

From the growing side, lemon balm is hard to mess up. It grows like crazy, smells great, and you can cut it back all season long.

Followup to my Tulsi Holy Basil post:
*every time I went to a local garden shop and asked for the plant or seeds, I'd get this blank look.
*Finally ordered some seedlings off of Etsy. Looked great when arrived, then died.
*ordered a couple plants, I think from Home Depot which arrived looking healthy  One survived.
*Geez! Found some seeds. Started my own. Believe it or not they did well, even though it was late in season.
Harvested 2 full batches for dehydration. And got some seeds too!

There are so many different uses for medicinal herbs so I would recommend studying the ailment that appeals to you.

Then study what medicinals are good for that ailment.

Then ask here on the forum how easy are those plants to grow.

I started with parsley, lemon balm and culinary lavender.

The lavender was a disappointment and went away after a couple of years.

After not being able to water the plants due to an attack of gout, they went away so now I just go with what is growing wild on my property.

 Last winter, which was single digit temps, I actually had a lemon balm survive. It was in a raised bed that was 3 feet off the ground. We had a week long ice storm and I didn't get it covered at all. So I was happily surprised when it sprouted and it grew like crazy!
 I also planted LB seed in another raised bed with the tulsi. It did well too, but was much more tender being new plants. The older one had tougher stems and 3 times the size of leaves.
 I'm guessing between the old plant and 2 newbies, I harvested enough to last until next spring.
 I'm going to start some seeds of Tulsi and Lemon balm inside to see how they overwinter indoors too.
 If you can find local plants or some seeds online, give it a try next spring. Eat fresh as you walk by, use leaves fresh in salad or on a sandwich,  make tea or tincture.
Good growing!

K, your two posts kind of prove the beginner point. Lemon balm survived single digits and a week of ice with no cover, and Tulsi had you hunting down seeds after the shop seedlings died.