Skins are basically just personal preference. Some people can read skins where the notes are all the same color, some people need the notes to be different colors. Some players can read arrows best, some prefer circles, and others prefer bars. I personally use an old o2jam skin where the columns are "white, blue, white, yellow, white, blue, white" with very small columns.
I think the way you practice depends on what you want to be good at, at least to some degree. If you're a player who likes to be able to get SS on easy maps, but doesn't care about playing harder stuff, you would probably want to just keep playing the same difficulty of stuff over and over again. But if you want to get better at harder maps, then the key is to keep trying to push your skill level up by playing stuff that's outside your comfort level.
I enjoy playing hard stuff, so I actually practice on some songs that I need nofail for. I also play a wide range of difficulty. Sometimes I play stuff I can get 97-98% on, sometimes I play stuff I can barely (usually if I can barely it I get somewhere in the 80% range, depending on the hp drain and whether there's a hard difficulty spike in the map).
Some people argue that playing stuff you can't get at least around an A is bad because it means you're "mashing" to get through the song, but I feel like that depends on whether you're a very accurate player or not. I'm not an accurate player, so even getting above 97% on easy maps is hard for me, and my accuracy really gets bad when something is actually hard. I don't focus too much on getting a specific score or accuracy on what I play. I just focus on trying to beat my top score the next time I play it.
I don't replay maps very often either. I personally feel like by playing a very wide range of different kinds of maps and learning to get good at sightreading patterns is better than relying on memorizing songs and replaying the same map over and over to try to get a good score on it.
I think the way you practice depends on what you want to be good at, at least to some degree. If you're a player who likes to be able to get SS on easy maps, but doesn't care about playing harder stuff, you would probably want to just keep playing the same difficulty of stuff over and over again. But if you want to get better at harder maps, then the key is to keep trying to push your skill level up by playing stuff that's outside your comfort level.
I enjoy playing hard stuff, so I actually practice on some songs that I need nofail for. I also play a wide range of difficulty. Sometimes I play stuff I can get 97-98% on, sometimes I play stuff I can barely (usually if I can barely it I get somewhere in the 80% range, depending on the hp drain and whether there's a hard difficulty spike in the map).
Some people argue that playing stuff you can't get at least around an A is bad because it means you're "mashing" to get through the song, but I feel like that depends on whether you're a very accurate player or not. I'm not an accurate player, so even getting above 97% on easy maps is hard for me, and my accuracy really gets bad when something is actually hard. I don't focus too much on getting a specific score or accuracy on what I play. I just focus on trying to beat my top score the next time I play it.
I don't replay maps very often either. I personally feel like by playing a very wide range of different kinds of maps and learning to get good at sightreading patterns is better than relying on memorizing songs and replaying the same map over and over to try to get a good score on it.