Index Funds, Top 10 on Stock Market and high risk companies that haven’t took of yet

Need some advice as a newbie. If this is not the right thread for newbies on stocks and such, let me know where should I be heading instead.

I've made a preliminary investing plan. Let me know if you'd change something. I'm operating with 4 figures closer to 10 than 1, just so that you have somewhat of an overview. Also, I'm from Europe.

I'll put 50% of my savings into S&P 500, just cuz it's better than to keep in the bank.

Then I intend to put 2k$ into the stock market. I know it's not a lot, but I'll keep adding every month from my paycheck. I'll put 50% into 2 companies from Top 10, for now I choose Microsoft and Nividia. Also thinking about Amazon, but idk, for now I'll leave it.

Then, I'll put 5-10% into companies with low market cap, that I think (after doing research) may pop off any time soon. I'll treat it as a gamble, as I'm putting the kind of money I can afford to lose.

Then I'll put 10-15% into AI industry company/ies. Haven't decided which one yet tho, haven't made enough research yet.

Then, I'll put remaining 30% into companies or industries I know something about, probably local companies in my country, or EU companies.

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I also have a few questions, since I'm a beginner:

1. For people living in the EU – what would be the best app/website that has stock market + index funds? That also has worldwide stocks, not only USA stock. Aaand – that doesn't have big fees for each trade, comparing to other websites.
2. Can you recommend any source of information about stocks? Of course it's best to do my own research, but I know from experience, that there may be companies or industries I'm not aware of, and it's good to be up to date on things, when investing in stocks.
3. Any advice for a newbie? There may be things I don't even know I should be asking about, so if anything pops, let me know. I'll highly appreciate any advice.