Just answering op because I can already tell the rest of the thread is poop.
1) it's not bad to alternate
- Using just your fingers is in fact a good way to learn to maintain control if you switch routinely between your primary and secondary fingers
- In theory if you can single tap half notes at certain speeds with both of your fingers you will be able to stream at said speeds and under (With proper practice of course)
- Alternating has been proven to be just as good as single tapping, but you will hit a wall at some point with finger speed if it's not practiced in a certain manner
- Alternating can be thought of as 'Slow streaming'
- If you're stuck on alternating simple maps with few short streams you honestly wont get anywhere
2) Pay attention to the end of the sliders
- Learn to release in time with the music at the right notes and it should make it easier to manage
- Slider ticks are just as important too, pay attention to those so you can time 'Extended sliders' correctly too. Ticks are supposed to be their for sound effects mostly
- Generally sliders are either short, half, whole or extended
= Short sliders are a bitch and you just have to get the hit and release correct, if they're something like Hanzer's "Miss You" it will just take practice, sometimes they're used as 'Slider streams'
= Half notes can be common in some maps and usually will be short and timed for jumps depending on the speed of the map; they're good for getting an idea of what the rhythm of the map is.
= Whole notes can commonly have a slider tick right in the center at an equal distance from the start to the end, if there's no tick you can generally tell because they're simply twice as long as the other sliders
= Extended sliders usually appear 3/4 through the slider so if you see a slider tick towards the end of a slider hold on a bit longer instead of reading it incorrectly. It's annoying when a map has a stray extended slider and it's the only one in the map so you simply have to take a mental note of it and retry if you mess up. One thing I hate is when they time it to where the tick is the actual end of the slider and they have the extra end note for flare.
* I'm certain you would call these different things, or there are official names but you get the general points I'm trying to get across