If you had a bunch of money in your WealthSimple TFSA or FHSA and weren't quite sure what to invest in yet, is there a creative way to park it and earn something that is essentially 0 risk?

I'm a noob at investing by myself so please bear with me. Let's say I have 100k in my TFSA and 20k in my FHSA, both as cash. They came as a result of investments in a GIC, so I transferred them to my WS account from my old bank as cash (both the TFSA and FHSA). My contribution room and everything is still there (it was from TFSA to TFSA). Now in WealthSimple, I opened a TFSA account and FHSA account and ensured they were 'trading' accounts, so when I click them I see 'Start Trading' **Long story short my question is** what can I do with the money just sitting there collecting nothing to ensure it collects something until I fully decide what ETFs to invest in (that was my original plan, but worried with the AI bubble). Can I buy some sort of ETF inside wealthsimple that is basically 0 risk? And if so, do I just buy 100k of it right away, and if I do that, can I move them to another ETF (like VGRO or VEQT if I go that route) and not affect my TFSA (effect it as in it wouldn't count as a withdrawal), does that make sense? Or is it when I buy an ETF I'm stuck with it until I decide to cash out my TFSA?