Another thing which you’ve alluded to but I didn’t mention is a good way into investing is to buy stock in companies you know, use and like. This help you learn the ropes while being at least familiar with what a company does.
I would be cautious about sharing your complete number, for reasons of security/privacy/fraud. You can re-share it but blurring the final two digits (there’s an option to blur in the upload process, I understand).
When i started i kept it simple bought IUKD …been a fave since, tracks dividend stock, pays 1/4ly dividend and 0% purchase tax. I personally tend to play around in the AIM market something like BUR or AVCT seem to give a nice rollercoaster ride for newbies… going up then down and hopefully back up. Again no “tax” to lessen your purchasing power… all money goes on shares!!. My inital biggest mistake was not realising there was a buy/sell price and a gap in-between where most of my initial money fell into.