Arties and Missiles seem way more popular than Autocannons on the Loki these days. That’s not to say autos are no good. They’re fine. It’s just that the Loki is one of the rare cases where Arties/Hams are especially good because of the bonused webs.
Bjorn did an awesome arty kiting fit recently with SPICY alpha, check it out here: https://www.youtube.com/watch?v=HPU8If-XryI
The missile fits make the ship look a lot cooler imo. Not sure if that matters to you but to some people it does.
If you like rapid lights there’s this Headhunter Jax cloaky fit, good for killing 100mn VNIs:
Summary
[Loki, *Headhunter JAX’s Loki]
Caldari Navy Ballistic Control System
Caldari Navy Ballistic Control System
Dread Guristas Ballistic Control System
Nanofiber Internal Structure II
Corelum B-Type 50MN Microwarpdrive
Dark Blood Warp Disruptor
Federation Navy Stasis Webifier
Shadow Serpentis Stasis Webifier
X-Large Ancillary Shield Booster, Navy Cap Booster 400
Corpii A-Type Small Energy Neutralizer
Corpii A-Type Small Energy Neutralizer
Covert Ops Cloaking Device II
Rapid Light Missile Launcher II, Mjolnir Fury Light Missile
Rapid Light Missile Launcher II, Mjolnir Fury Light Missile
Rapid Light Missile Launcher II, Mjolnir Fury Light Missile
Rapid Light Missile Launcher II, Mjolnir Fury Light Missile
Rapid Light Missile Launcher II, Mjolnir Fury Light Missile
Medium Hydraulic Bay Thrusters II
Medium Polycarbon Engine Housing I
Medium Polycarbon Engine Housing II
Loki Core - Immobility Drivers
Loki Defensive - Covert Reconfiguration
Loki Offensive - Launcher Efficiency Configuration
Loki Propulsion - Intercalated Nanofibers
Acolyte II x5
Inferno Fury Light Missile x200
Navy Cap Booster 400 x9
And lastly active tank HAM fits are popular now as the other guy mentioned. There’s no definitive fit. You can go cap stable with cap batteries or use a cap booster setup. You can use medium, large or XL shield boosters. Ancillary or regular. Anything goes.
I like to use a cloaky cap stable dual medium shield booster setup, with HAMS but I wouldn’t recommend it because its stupidly expensive. Although I would recommend the ■■■■ out of HAMS in general. I personally prefer an afterburner or dual prop over MWD. The afterburner has just saved my ass so many times. Afterburner+ web(s)=escapability.
The nice thing about t3s is you can fit a combat probe launcher and cloak with very little drawback. Your ship will still be ridiculously strong, albeit probably expensive.
The one thing everyone pretty much agrees on is the immobility drivers. Gotta have em. It can’t be overstated how good this subsystem is. They’re what make the Artillary and HAM setups work as well as they do. Go ahead and splash some ISK on the web(s). Enchant your web for silly range.
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Of course, as the other guy mentioned. This is NOT a good ship to learn on. It’s expensive and you lose SP when you die in one. I’d suggest picking a weapon system you’re attracted to, then learning on other ships with that same weapon system.
Autos - Stabber, Rupture, Hurricane, HFI
Arties - Firetail, HFI, Tornado, Sleipnir
Rapid Lights - Caracal, Cerb
HAMs - Cyclone, drake
Probably a few dozen more I can’t think of right now. None of these quite give you the experience of flying a Loki but the experiences you gain could still be helpful.
The other way to learn is to go out hunting in a budget Loki and be super risk averse and take fights you know you can win, while slowly getting more and more daring. The Loki, and T3Cs in general give you quite a wide margin of error but none of that matters in the face of a blob. If you can manage to avoid blobs you’ll be able to enjoy being an apex predator, and you can pick on all kinds of stuff, even some small gangs.
I hope this helps. Good luck!