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What are some good things to practice to get myself trained to better hit one string? I keep hitting two strings unintentionally. It's common across all strings.
Is it just a matter of practice to get the right angle on each string to avoid hitting the one adjacent to it? Or are there exercises that can help?
Being a beginner take this for what its worth, but I have the same problem, and do the elevator practice. Where you life your elbow and make sure it stop in the same position each time for each string. This is done on open string and you have to stop on each string and play 4 beats. Hope this helps you its helping me.
With violins there is no fretting over the music.
Changing string problem ................
Get a simple piece of music. Play it BUT..... make sure the bow is on the string you want BEFORE you start the bow moving. Then make the note with the bow to confirm the position. This routine forces you to give special attention to bow angle. It becomes a matter of concentration.
If all that is confusing then do "ladders" or whatever BUT draw a full bow stroke as the music allows.
When you come to a fork in the road, take it.
If there's no FM video on your exact issue, whatever it may be, you can youtube a solution to about any violin related issue. You'll then have to separate the wheat, from the chaff (and there's much more chaff than wheat, but..). Here's a good place to start on string crossings.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. ~Herm Albright