based tip
important tip

The best piece of advice I could give to people under 2000 who want to improve is that you shouldn't be playing the Sicilian or E4 E5 as black. White has many options that make it difficult to play as black at that level. Instead play the Caro-Kann defense which is much simpler. I'm not trying to say the Caro is the best opening (I play e5 mainly and the classical Sicilian occasionally) but the plans are simpler and you won't have to waste what at that level is valuable time on learning what to do against all the various gambits and options White has available.
I mean… they’re perfectly playable, as long as you choose the right lines
I played e5 from when I started playing chess to like 10 months ago… so it’s definitely playable below 2000, given that the lines chosen aren’t excessively complicated
By the time I started playing the Sicilian (which is what I play now), I was beyond 2000, so I don’t have the experience of playing it earlier… but I have friends who are quite a bit lower rated who play it… again, all about the lines which are chosen.

The best piece of advice I could give to people under 2000 who want to improve is that you shouldn't be playing the Sicilian or E4 E5 as black. White has many options that make it difficult to play as black at that level. Instead play the Caro-Kann defense which is much simpler. I'm not trying to say the Caro is the best opening (I play e5 mainly and the classical Sicilian occasionally) but the plans are simpler and you won't have to waste what at that level is valuable time on learning what to do against all the various gambits and options White has available.
i'd disagree because it's hard to get uncomfortable positions out of the opening in the sicilian

yes, but there are like a million different lines
exactly but those million lines usually depend on what you play rather than your opponent, learning a few lines is pretty good to throw off opponents and gain comfortable positions. I don't recommend it for everyone but i process info really well so learning lines isn't an issue for me personally
The best piece of advice I could give to people under 2000 who want to improve is that you shouldn't be playing the Sicilian or E4 E5 as black. White has many options that make it difficult to play as black at that level. Instead play the Caro-Kann defense which is much simpler. I'm not trying to say the Caro is the best opening (I play e5 mainly and the classical Sicilian occasionally) but the plans are simpler and you won't have to waste what at that level is valuable time on learning what to do against all the various gambits and options White has available.