ETF Fees/ Charge

[Alien]

How are ETF running costs charged?

Hi, Sorry if this has been answered before but I couldn’t find it. ETFs have ongoing costs like other funds but buying them via T212 seems to be free. How are these costs accounted for via trading 212? Also going on from this are their trading costs for buying/ selling ETFs via T212? Particularly if I’m buying small amounts frequently I don’t want to be missing this. Thanks