docs: Add section explaining strategy imports

docs/includes/strategy-imports.md

@@ -0,0 +1,41 @@
+## Imports necessary for a strategy
+
+When creating a strategy, you will need to import the necessary modules and classes. The following imports are required for a strategy:
+
+By default, we recommend the following imports as a base line for your strategy:
+This will cover all imports necessary for freqtrade functions to work.
+Obviously you can add more imports as needed for your strategy.
+
+``` python
+# flake8: noqa: F401
+# isort: skip_file
+# --- Do not remove these imports ---
+import numpy as np
+import pandas as pd
+from datetime import datetime
+from pandas import DataFrame
+from typing import Optional, Union
+
+from freqtrade.strategy import (
+    IStrategy,
+    Trade, 
+    Order,
+    PairLocks,
+    informative,  # @informative decorator
+    # Hyperopt Parameters
+    BooleanParameter,
+    CategoricalParameter,
+    DecimalParameter,
+    IntParameter,
+    RealParameter,
+    # Strategy helper functions
+    merge_informative_pair,
+    stoploss_from_absolute,
+    stoploss_from_open,
+)
+
+# --------------------------------
+# Add your lib to import here
+import talib.abstract as ta
+import freqtrade.vendor.qtpylib.indicators as qtpylib
+```

docs/strategy-callbacks.md

@@ -24,6 +24,8 @@ Currently available callbacks:
 !!! Tip "Callback calling sequence"
     You can find the callback calling sequence in [bot-basics](bot-basics.md#bot-execution-logic)
 
+--8<-- "includes/strategy-imports.md"
+
 ## Bot start
 
 A simple callback which is called once when the strategy is loaded.

docs/strategy-customization.md

@@ -407,6 +407,8 @@ Currently this is `pair`, which can be accessed using `metadata['pair']` - and w
 The Metadata-dict should not be modified and does not persist information across multiple calls.
 Instead, have a look at the [Storing information](strategy-advanced.md#storing-information-persistent) section.
 
+--8<-- "includes/strategy-imports.md"
+
 ## Strategy file loading
 
 By default, freqtrade will attempt to load strategies from all `.py` files within `user_data/strategies`.