When I started kayaking, kayaks were not too common. If you saw a kayak on a car, you probably knew them. I started out with a few guided trips and then a very comprehensive weekend course, both classroom and on-water. . It emphasized safety on the water including rules of navigation, wind, waves, current, basic navigation, and cold water safety among other things.
Following this i did a lot of long distance solo paddling and soon joined the Chesapeake Paddlers Association, where I met a lot of very skilled paddlers that i began paddling with. I learned a lot from them and continue to do so. I don’t do as many solo paddles any more and now lead trips with my wife, who I met paddling, and join in other’s trips, including day trips, car camping trips, and kayak camping trips. My wife and I sometimes paddle with just the two of us.
While I still enjoy solo paddling, as you can go where you want at the pace you want, I had my share of adventures and close calls when starting out. Relying on what I learned in the course I took and hopefully some common sense, a degree of caution, and luck, I didn’t die or have to be rescued by the USCG.
Knowing what I do now, I probably wouldn’t have recommended many of the solo paddles I did on open water to begin with.
Starting out, beside a class, I recommend trying to hook up with some other kayakers that hopefully have some experience and the common sense not to get you into situations that are too far above your skill level. Paddling with others is an order of magnitude safer than paddling solo, experienced or not.
If this is not possible, start out in protected water and as your skill level increases, gradually seek to expand on your skills and increase your comfort level.
As much as some people, myself included enjoy paddling solo, I do not recommend starting out this way in big open water. To do so safely requires a certain level of experience, skill, and knowledge that doesn’t come quickly or with a class or YouTube videos.