Best S &S Isa

[Serasar]

I’m looking to put £20,000 into an s&s isa. I need it to be one that I just deposit the money, forget about it for 10 years or so and then add to it next April.

I am not very good at buying stocks etc. I put £100 into Trading 212 and didn’t have a clue what I was doing! A poster did suggest AJ Bell Dodl? It needs to be very simple! One more question- because of this £100 in T212, does that mean I can only put in £19,900? Thank you for any help

Nonsense. It isn't free because it has poor customer service, its free because they make most of their money from the CFD part of their business

I use AJ Bell, Fidelity, Vanguard and Trading 212.
Vanguard is the most frustrating one of the 4 very slow at everything. AJ Bell are very efficient and have very responsive customer service, costs are similar to Fidelity but I would give AJ Bell the edge. 212s Pie feature is brilliant though make investing in multiple ETFs very simple.

Something that might help you get going is to feed your money in over several months. We are according to the experts (when have they ever been wrong?) nearing the last stages of the AI Bubble that's been inflating over the last 3 years. If AI fails to deliver profits to match the immense spending going on then the stock market could correct pretty violently, but nobody knows when/if this will happen.
If you invest in a Global Tracker/S&P Tracker you will be heavy exposed to this bubble. I would definitely recommend doing a good bit of research before you commit and if you go stocks only be comfortable with possibility of a 40% drawdown at some point.

Take a look at Rebel Finance - they have a free course on YouTube which takes you through all the steps of investing. Their main focus is getting financial independence and retiring early (FIRE) but their advice is good for general investing too.

https://rebeldonegans.com/finance/rfs/

I use Vanguard and spread my investments into a mixture of low cost index trackers. It's very low in terms of fees. Have a read of Mr Money Mustache.

I go for a mixture of all world, European, FTSE 100 and S&P500.

I invest every month because I want some chance of buying in dips across the year (I think it's called dollar cost averaging) but that works for me because it fits with my monthly income.

The usual phrase is "it's time in the market not timing the market that counts".