The adapters route works, but here's something the others didn't mention: check if your phone came with a USB-C cable in the box. Most do nowadays, and if it did, you can use that cable with any old power brick that has a USB port - even those chunky old dual-USB wall adapters from five years ago. So you might have more options than you think before buying anything new.
If you do go the adapter route, grab a USB-C to micro-USB one since those are genuinely cheap and reliable. Just keep in mind they add bulk to your cable, so they're better for stationary charging at home or the office rather than throwing in a bag. The Lightning adapters exist too but tend to be pricier and less common.
One practical hack nobody talks about: if you've got an old charger with good build quality that you really liked, consider buying just the USB-C cable separately and ditching the power brick altogether. You can use that brick with your new phone's cable, and suddenly your old charger isn't dead - it just got repurposed. Saves money and keeps stuff out of the drawer.