Some people tend to not use the spacebar, and instead replace the thumb with another finger on the dominant hand. For example, a person using D F J K for 4K might use D F J K L for 5K instead of D F Space J K. I personally use the spacebar, and I think 5K with spacebar is a good way to get used to playing with spacebar for later improvements.
In addition, I HIGHLY suggest that you download mania specific beatmaps instead of playing autoconverts (maps that have been converted to mania from a standard chart). Autoconvert mania patterns are ridiculously limited and offer almost no diversity that vertical scrolling rhythm games have to offer. Play the charts that are meant for osu!mania. You'll find a huge difference as you play.
Holo The Wolf wrote:
I read under a mania tips somewhere that it is best to try and play all types (4k,5k,6k ect..)
Yes, I'd like to add that it's always better to get used to the higher keymodes first. This allows you to improve with the lower keymodes even without playing them. For example, you will naturally improve in 4K if you play 7K only. However, you will not improve at 7K if you play 4K only. People who have started out with 4K only and have improved to a certain extent have a really hard time getting used to the higher keymodes.
All that being said, here are some choices for you:
If you'd like to have a go at 7K right away, I've created a
7K Dan Course that allows players (even those that have just begun to play 7K) to gauge their skills. There is also a
4K Dan Course, but this is geared towards more advanced players so I don't recommend it.
However, this
4K Skill Analysis Mapset is very beginner friendly and you might actually be able to use this for your benefit.
For individual songs that are geared towards beginners, I suggest these maps below:
https://osu.ppy.sh/b/218189 <- this one is really just for getting used to which keys to press, lol
https://osu.ppy.sh/b/222940https://osu.ppy.sh/b/193129https://osu.ppy.sh/b/243830https://osu.ppy.sh/b/382544https://osu.ppy.sh/b/365270https://osu.ppy.sh/b/343841https://osu.ppy.sh/b/554268https://osu.ppy.sh/b/425085https://osu.ppy.sh/b/658182https://osu.ppy.sh/b/488029http://osu.ppy.sh/b/648016https://osu.ppy.sh/b/479204There are tons of other good maps that you can find in the beatmap tab under osu!mania, so I suggest you go check that out to find maps that you like.
Good luck!