There’s lots of free stuff on-line and I would start by reading anything and everything, not getting too technical and after a while when some of the jargon starts to stick you should start to recognise common themes, similar to the hifi mantras of ‘source first’, ‘balanced system’ and so on. The Times and FT have lots of good coverage and their regular commentators provide a suitably sceptical counterbalance to the investing web-sites and platforms.
I started off with a subscription to Investors Chronicle which was useful at the outset but with hindsight tries to do too much and in its individual coverage of results doen’t have the resources to dig too deep.
Given that the UK market is regarded as being one of the better regulated markets there’s still enormous scope for presenting a company’s accounts in a favourable light let alone stepping over the line of financial truth. The regulatory authorities are very slow moving and in the rare event of prosecution, penalties aren’t much of a deterrent and the money is long gone.
The market will welcome you with open arms because they are likely to gain at your expense so you should only invest what you can afford to lose.
That said I’m sure you will find it fascinating to see how money works behind the scenes but the odds are heavily stacked against you. I’ve been mostly lucky so far.