Cost of buying US stocks

I was going to jump in to buy some US shares today but stopped as I’m unsure about the tax implications
I currently have an ISA here in the UK so with buying UK stocks I dont pay any capital gains tax or income tax
My question please is if i buy a US stock through trading 212 will I be subject to US tax on any gains i potentially make?
I realise my purchases/sales will be subject to currency fluctuations etc, but will I need to put in a tax return here in the UK to deal with any tax charges incurred in dollars?

ISA is completely cap gains free regardless of where the stock trades.

You’re not a US citizen so not subject to US tax.

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Your ISA is a tax free wrapper. You might have some transaction fees or foreign dividend taxes, but anything you buy will be free from any UK tax.