what c# source should i use

i'm a new c# learner
i want a source to work with as i'm going on
a source that's fairly complete with good features if there is any
or a source with some bugs that i'd be able to fix soon
just something to go with as i learn
thanks in advance

You Can work on any source but first come here:
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And download any base and study it before yo work on any source may after you learn create your own source or be able to update on other source