Yes, Samsung Galaxy M10 supports OTG. USB OTG or USB On-The-Go is one of the most recent technologies that allows you to connect your pen drives and in some cases hard disks to your smartphones and tablets. It has a cable and through that cable, you can directly view and use your pen drive in your smartphones.
The Samsung Galaxy M10 comes with the Samsung Exynos 7 Octa 7870 chipset which is quite a good processor for the price of the device but not the best.
The chipset has Octa-core, 1.6 GHz, Cortex A53 processor which is built on 64-bit architecture. It has Mali-T830 graphics.
Check full device specifications Samsung Galaxy M10
No, Samsung Galaxy M10 does not have NFC feature. Near Field Communication allows you to send money, transfer files to other devices when in a certain specified range.
Though it does not come with NFC feature you could still use Bluetooth or several third-party applications such as ShareIt, Xender for file transfer.
Complete product specification: Galaxy M10
No, Galaxy M10 does not have a hybrid SIM slot.
Galaxy M10 comes with a dual sim slot along with a dedicated memory card slot.which is expandable up to 1 TB.
Both the sim slot of Galaxy M10 supports 4G bands.
You can check here for product spec: Galaxy M10
Samsung Galaxy M10 is an amazing budget smartphone which has won hearts by its elegant design along with strong configuration at such an affordable price. It has been "Out of Stock" for a while, but it available on Amazon now.
You can see detailed specs here: Samsung Galaxy M10