When picking up advice from the web it's always important to know the commercial interests of those giving it. Particularly on investment matters.
The UK Shareholders' Association (UKSA) is a not-for-profit membership organisation. It is committed to helping all investors and savers, whether members or not, and to be a trusted source of truths that the financial sector will not willingly publicise. It is funded entirely by membership fees and individual donations and therefore independent of all conflicts of interest, and deserves support.
Sharesoc is another organisation that promotes individual shareholding, but with a greater focus on the skilled private investor and active campaigning in connection with specific corporate misdemeanours.
MoneyHelper is the site for government sponsored advice. It is a recent (2021) consolidation of a number of separate sites, supported by Money and Pensions Service. Remember that no government advice site is going to upset an industry that contributes 15% of national tax revenues, but with that proviso they do their best.
HM Revenue and Customs (HMRC) is the horse's mouth for any tax regulations.
Martin Lewis at MoneySavingExpert has the pre-eminent independent site covering basic money management skills, with much practical advice and information.
retireguide.com is a US site and therefore set within the US savings scene. But its basic approach in its first few pages reinforces ours, and within a very fresh site design. We have no information on its funding or ownership so cannot comment on its potential for bias.