Buy anonymous, do not let the state know you own something. What it knows you own it can and sooner or later will steal from you.
Do not buy what somebody wants to sell to you, it most likely is not worth much, thats why he wants to sell it. Do not sell what the other wants to buy from you, it probably means it is precious.
Do not expect the other to be stupid or to act stupidly. If later it turns out he was, thats an enjoyable bonus only!
And gold, gold always means physical gold, never paper gold. And physical gold is not investment to generate profit (that why accoriding arguments against it do not bite, the speaker has a paper selling agenda or does not know what he is talking of). Holding physical gold is a safety, the attempt to keep and protect what is yours. The purpose is that it is there -
and more it must not do. Generating interest or profit is not why you buy gold. If things go well, it can be a side-effect. But it should never be the intention. Because history shows that gold also can move counter-intuitively and against the expected logic.