Lets go down the options.
Romance: You need to have enough knowledge and self-awareness to not make a toxic relationship, then glorify it.
horror: The second worst option, because you have to be descriptive when it counts, while holding back enough information to keep the idea of the unknown.
tragedy: The absolute worst option to start writing since you got to pace out the tragedy well, then make the downfall believable and drastic. A lot of foresight needs to be used with this genre.
xianxia: Don't know much about genre, so I can't add anything to this.
sci-fi: Sci-fi is a pretty good starting point. You just need to vaguely explain the futuristic mechanics and that'll be it. As long as you have an interesting plot, and a creative mind for possible futuristic machinery, this is a good choice.
Slice of life: The best starting choice, not because its easy, but because its safe. The reason why I say it isn't easy is because outside of possible smut, you have to keep your audience reading with little to no plot. But its a good place to start out if you want a rather safer option.
comedy: The third worst option. First off, you gotta be funny. Second, you gotta translate your jokes to text. You can't just say someone makes a funny face and expect that to be comedy. There needs to be some cleverness in the delivery, set-up, and execution.
The whole point of Sci-Fi is to explain how things work... It's not Sci-Fi otherwise, it's just Fantasy...
I'll add since a lot of people keep saying smut/romance, that that's one of the harder genres for the same reason that comedy is. There's a reason everyone talks about bad smut or crappy romance ruining stories. People have very high standards for it. Unreasonably high. Not to mention everyone has different tastes for what's good or bad. So if you do start out with it, you'll get a lot of flak right out the gate unless you just never share it. And then how are you supposed to improve?
Fantasy isn't fantasy because nothings explained. Fantasy is fantasy because its set in a world unlike ours, and normally with supernatural and magical elements. You have to explain magic in fantasy for instance. Sci-fi is the same as fantasy, just that its set in our world in the distant future. Or you could do a star wars move and make a sci-fi/fantasy.