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+# Exceptions handling
+
+Unfortunatelly, exceptions handling in this library is a bit difficult in some places, but that have at least two reasons: flexibility and usability.
+
+## "In place" handling
+
+In case you know, where exceptions are happening, you may use several tools for exceptions catching:
+
+* Catching with result
+* Catching with callback
+
+### Catching with result
+
+If you prefer to receive `Result` objects instead of some weird callbacks, you may use the next syntax:
+
+```kotlin
+safelyWithResult {
+    // do something
+}.onSuccess { // will be called if everything is right
+    // handle success
+}.onFailure { // will be called if something went wrong
+    // handle error
+    it.printStackTrace()
+}.getOrThrow() // will return value or throw exception
+```
+
+### Catching with callback
+
+Also there is more simple (in some cases) way to handle exceptions with callbacks:
+
+```kotlin
+safely(
+  {
+      // handle error
+      it.printStackTrace()
+      null // return value
+  }
+) {
+    // do something
+}
+```
+
+### Bonus: different types of handling
+
+There are two types of handling:
+
+* Just safely - when you are using something to obviously retrieve value or throw exception. When handling callback has been skipped, it will throw exception by default. For example:
+```kotlin
+safely(
+    {
+        it.printStackTrace()
+        "error"
+    }
+) {
+    error("Hi :)") // emulate exception throwing
+    "ok"
+} // result will be with type String
+```
+* Safely without exceptions - almost the same as `safely`, but this type by default allow to return nullable value (when exception was thrown) instead of just throwing (as with `safely`):
+```kotlin
+safelyWithouExceptions {
+    // do something
+} // will returns nullable result type
+```
+
+## Global exceptions handling
+
+The most simple way to configure exceptions handling is to change `CoroutineContext` when you are creating your `CoroutineScope` for bot processing:
+
+```kotlin
+val bot = telegramBot("TOKEN")
+
+bot.buildBehaviour (
+    scope = scope,
+    defaultExceptionsHandler = {
+        it.printStackTrace()
+    }
+) {
+    // ...
+}
+```
+
+OR
+
+```kotlin
+val bot = telegramBotWithBehaviour (
+    "TOKEN",
+    scope = scope,
+    defaultExceptionsHandler = {
+        it.printStackTrace()
+    }
+) {
+    // ...
+}
+```
+
+Here we have used `ContextSafelyExceptionHandler` class. It will pass default handling of exceptions and will call the block in most cases when something inside of your bot logic has thrown exception.