I want to contribute to Apache Ignite

[D]

Hello, Everyone!
 
My name is Denis Polozhaev. I want to contribute to Ignite. I would like to 
start from tickets:
IGNITE-21425 Update examples in Data Modeling - Affinity Colocation
https://issues.apache.org/jira/browse/IGNITE-21425
IGNITE-14726 [Log4j2] Omitted start character [ in default log pattern
https://issues.apache.org/jira/browse/IGNITE-14726.
Please, help me to start contributing.
My ASF JIRA username is PolozhaevD.
 
Regards,
Denis Polozhaev