[Newcomer] Any ideas for microprojects ?

Hello,

We are students from Université Claude Bernard Lyon 1 in France in
first year of Master’s degree Computer Science
We want to try to contribute to the Git project as a part of
our studies.
Our mentor in this work is Matthieu Moy, who has already contributed
to Git a lot.

So, we are looking for ideas to start our contribute.
Can you help us ?
And if we have an idea, how we submit it to be sure that we don't
go in something wrong. Is there a special tag ?

Thank you in advance for your help.

Sincerely,
COGONI Guillaume and BRESSAT Jonathan