Like I mention on the title I am not promoting any product but I am trying to show something which might be helpful if you own a new MacBook with only USB C ports.
If you own new MacBook then there is this device which has all kind of adapters all in one. You need not buy a separate adapter for ethernet, USB, HDMI, and SD card reader.
These can be found in any local shop or online store. Also, this is not the only brand that has this product.
I hope you find it helpful.