personally I would advise anyone who doesn't know that what they are doing not to randomly start investing in the market directly, by buying individual shares.
Not just because the markets are usually efficient (IMO of course), but rahter their investment aims, would probably be better served by drip feeding regular amount into a low cost tracker fund wrapped in an ISA.
In my experience any lay persons analysis of why a stock might move is usually either incorrect or already priced in.
Also if you are thinking of getting involved in some trading, and not value investing, then you would be better served to use spread betting platforms, as the transaction costs of direct investment will eat into someone who is just having a dabble, and massively erode and returns.