Just about any 0.1" header will do. There's no locking ramp, and lots of clearance. "Dupont" style headers (whoever owns the original line now), Molex SL, KK, etc.
MTA100 is IDC (insulation displacement connector), which is easy enough to use, but maybe unreliable.
https://forum.digikey.com/t/dupont-connectors-and-how-to-find-them-from-digi-key/3315You need either:
- Header strip. Solder wires to the pin tails. Samtec SSW series is a good choice.
- Housing with pins included. MTA100 is an example, IDC. You can hack it with pliers and a screwdriver, but a (fairly cheap) tool should preferably be used for insertion of wires.
- Housing and pins separately. You're shopping for the housing, and it's just that, the molded plastic piece. Then shop for pins that match the wire you're using. Then a crimp tool to apply them. Check datasheets or mfg product pages to verify that you have recommended, compatible parts.
For everything, components, tools, whatever: avoid eBay/Ali specials, shopping for cheap crap will get cheap crap.
Brand name tools for connectors are awfully expensive ($200+), but you can do a good job with more modestly priced, off brand tools (~$30), with a little practice, and maybe with shopping around (try a few, return the bad ones if you can?). Look for tools that have: replaceable dies; ratcheting action; adjustable crush depth; and have good documentation, including how to use them, what parts or styles of terminals they are compatible with, etc.
In a pinch, you can do crimp terminals with just pliers, of course you aren't making a proper crimp joint. Make up for this by soldering it. Do it carefully, with relatively little solder, just enough to get a fillet onto all strands, without wicking solder up the receptacle or leaving a blob that won't fit in the housing. (Don't solder properly crimped terminals -- they don't need it, and might even be worse for it.)
Tim