Update README.md

Author: abrahammenendez

README.md

@@ -1 +1,21 @@
-# java_performance_and_memory_management
+**What is this?**
+
+Some exercises I did for Matt Greencroft's course [Java Application Performance and Memory Management](https://www.udemy.com/course/java-application-performance-and-memory-management/).
+
+**What did I learn?**
+
+- How JIT compilation and the code cache really works
+- Differences between C1 and C2 compilers
+- Inner workings of the stack and the heap
+- Metaspace
+- String pool
+- Java Mission Control
+- Java Flight Recorder
+
+**How was the course?**
+
+Too monotone for my taste, but it gets the job done. I feel that I've learned a lot of in-depth knowledge about the Java.
+
+**Additional info**
+
+For the past six years I've taken a lot of courses in my free time. Sadly, I never thought about compiling them into a list. Since 2019, I've been trying to write down (and rate) every new course I take. You can see it [here](https://github.com/abrahammenendez/courses/).