I used to have a very simple rule.
Keep it simple.
I used to just invest in 1 company at a time , RBS or Barclays as they were highly volatile . Breaking every rule in the investment book that says spread your risk.
Bought on the way down, sold on the way up when the gain was about £60-70 k.
23 successful deals later in March 23,I called it a day in share dealing against my wife’s wishes. Glad I did because the shares are now worth £40 k less than when I sold them.
I now invest in land without planning permission, much more of a steady Eddie approach.
You can do as much research as you like, but without a crystal ball, it’s a lottery in this uncertain world we now live in.