diff --git a/README.md b/README.md
index 000b291..c81cc4f 100644
--- a/README.md
+++ b/README.md
@@ -4,16 +4,39 @@
 
 The project is a workspace containing the following packages:
 
-- [Rust](calclib/README.md). This is the main package containing all the logic. It is intended to be used in other Rust projects without any dependency to `pyo3` and `jni`.
+- [Rust](calclib/README.md). This is the main package containing all the logic. It is intended to be used in other Rust projects without any dependency to [pyo3](https://github.com/pyo3/pyo3) and [jni](https://github.com/jni-rs/jni-rs).
 - [Python](pycalclib/README.md). The Python layer for creating the Python module.
 - [Java](java/README.md). The Java layer for creating the Java module.
 - [WASM](wasmcalc/README.md). The Web Assembly layer for creating the WASM module.
 - [REST-API](calcserver/README.md). The REST-API server extension.
 
+## Recommendations
+
+### IDE
+
+For programming Rust the best IDE is VS Code with the following plugins:
+
+- Rust Extension Pack
+  - rust-analyzer
+  - crates
+  - Even Better TOML
+- Prettier - Code formatter (Rust)
+- Microsoft C++ on Windows
+- CodeLLDB on maxOS / Linux
+- Python, if you plan to develop Python extensions.
+
+A short guide can be found [here](https://code.visualstudio.com/docs/languages/rust).
+
+A promising alternative is [RustRover](https://www.jetbrains.com/rust). A feature rich Rust IDE from JetBrains. Currently preview releases are available. If you plan to develop Python extensions then you should install the Python plugin.
+
+## Code quality
+
+To improve the code quality I use [clippy](https://doc.rust-lang.org/stable/clippy/usage.html), which is a very powerful linter.
+
 ## Conclusion
 
 Rust is a very versatile power horse. It is easy to use Rust in most used programming languages. For web applications Rust can be used on the server side with REST-API and on the client side with the [wasm-pack](https://github.com/rustwasm/wasm-pack).
 
-My preferred combination is Python and Rust. If the application has a UI I usually use Qt. For very simple UIs [FLTK](https://fltk-rs.github.io/fltk-rs) is preferred for smaller executables and easier license handling.
+My preferred combination is Python and Rust. If the application has a UI I usually use Qt. For very simple UIs [FLTK](https://fltk-rs.github.io/fltk-rs) is preferred for smaller executables and easier license handling. In Rust I implement the performance and security critical parts. The rest in Python for reduced development costs.
 
 If speed and / or security matters I would really recommend using Rust. The power features of Rust helps you reducing bugs and follow up costs.
diff --git a/calclib/README.md b/calclib/README.md
index 663eccc..144ed52 100644
--- a/calclib/README.md
+++ b/calclib/README.md
@@ -3,6 +3,36 @@
 This is the pure Rust library without any `pyo3` or `jni` dependencies.  
 This package contains all the logic and is intended to be used in other Rust projects.
 
+Build the library in debug mode with
+
+```sh
+cargo build
+```
+
+and in release mode with
+
+```sh
+cargo build --release
+```
+
+Run tests with
+
+```sh
+cargo test
+```
+
+Run the example with
+
+```sh
+cargo run --example calculator -- +1.5 -0.9
+```
+
 ## Benchmarks
 
 The example `calc.rs` in `benches` shows how to implement benchmarking with [criterion](https://docs.rs/criterion/latest/criterion).
+
+Run the benchmarks with the following command
+
+```sh
+cargo bench
+```
diff --git a/calcserver/README.md b/calcserver/README.md
index a95dd58..07c1210 100644
--- a/calcserver/README.md
+++ b/calcserver/README.md
@@ -7,12 +7,12 @@ The example [calcclient.py](https://github.com/brmmm3/calc-rs/blob/master/calcse
 
 To run the server in `debug` mode just call
 
-```rust
+```sh
 cargo run --bin calcserver
 ```
 
 To run the server in `release` mode just call
 
-```rust
+```sh
 cargo run --release --bin calcserver
 ```
diff --git a/java/README.md b/java/README.md
index 511f358..80fe1cf 100644
--- a/java/README.md
+++ b/java/README.md
@@ -1,2 +1,9 @@
 # `javacalclib`
 
+This is the Java layer for [calclib](https://github.com/brmmm3/calc-rs/tree/master/calclib). This package is for creating a Java extensions class using [jni](https://github.com/jni-rs/jni-rs).
+
+Follow the guide to create a Java extension [here](https://docs.rs/jni/latest/jni).
+
+Please notice the **naming convention**, which is very important here.
+
+Run `make` to compile the Java extension.