I've never taken any formal courses.
Here's my journey.
-Started out buying stocks at random. If the price dropped a ton, I assumed it "has to go back up at some point". Lost money.
-Learned that I could "short" and trade in both directions. Lost money.
-Learned about candlesticks and started using them. They showed much more info than a simple line chart. Lost money.
-Learned about "trend lines" and started drawing them. Anywhere I could connect 2 dots, and used the third dot to anticipate where price would find support/resistance. Lost money.
-Got a better platform. Much cleaner interface, no lag, nice drawing tools. Lost money.
-Switched time frames. 1m, 3m, 5m, 6m, 10m, 15m, 1 hour, etc. Lost money in each one.
-Tried many tick charts. Thought professionals aren't using time-based charts. Lost money.
-Experimented with various targets/stops. Tried risk:reward of 1:1, 1.5:1, 2:1, 3:1, 4:1, etc. Lost money for each one.
-Experimented with trailing stops. Lost money.
-Read random trading books. Psychology (Douglas), Trading (Brooks), Probabilities, etc. Learned a ton. Lost money.
-Questioned whether day trading was a pipe dream.
-Switched to swing trading for a time. Had mild success. Probably just the luck of starting a swing trading journey during a decade long bull market.
Back to day trading.
-Discovered ET. Lots of advice resonated with me. I reached out to one forum member in PM, and his suggestions helped me to get a grip, and do my own work.
Later I switched from drawing trend lines to using Moving Averages for that function. This helped a bit. Started to avoid trading in chop.
I definitely lost money in every phase, but, going through each phase was critical to my development, and enabled me to reach a point where I could test my own ideas.
The real turning point finally came when I had an idea for a single trading setup. The signal was very specific and clear. I looked for every occurrence in prior months/years, and in different market conditions, making detailed notes for each occurrence. I analyzed the results of several hundred occurrences in various conditions, and refined the signal.
I then developed the skill to recognize the setup in realtime, and the behavior to enter the trade with zero hesitation...
Even if the last 4-5 trades were losers.
Even if the first 3-4 trades in a single day were losers.
Finally, I learned to avoid all impulsive entries that were outside of my trade plan.
My real work is done in analysis. Trading is just "auto pilot". I login at 0930 EST, take every refined signal until no later than 1530, unless I feel like taking the day off.
Your brain is what will get you to your destination. A course may give you ideas to run with. So perhaps give it a shot. But either way, you probably have a ton of work left to do.