IBKR stocks and International Capital Gains Tax

I recently started an IBKR account, the initial plan was in VWRA only and chill, but I found some stocks that I believe to be of good value in the US and France.

How do taxes on capital gains (especially this) and dividends apply in this case? I have never filled taxes before, if I sold my stocks and left them in my IBKR account would that mean I don’t get capital gains taxed?

Does IBKR handle the dividend tax/capital gains tax side of things automatically by sending information to LHDN (since they have my TIN)?