Mention timezone setting importance

And correct .venv path

README.md

@@ -6,12 +6,19 @@ Recommended: [venv](https://docs.python.org/3/library/venv.html).
 
 ```shell
 # Optional
-$ python3 -m venv venv
-$ source venv/bin/activate
+$ python3 -m venv .venv
+$ source .venv/bin/activate
 
 $ pip3 install -r requirements.txt
 ```
 
+Your PC timezone is important for esphome schedules, as they will use compiler's
+timezone when syncing the clock (NTP). Consider changing it to your home TZ:
+
+```
+# dpkg-reconfigure tzdata
+```
+
 ## Compiling
 
 ```
@@ -21,7 +28,7 @@ $ cp -i templates/secrets.yaml{.sample,}
 # Edit both secrets.yaml files.
 
 # Optional
-$ source venv/bin/activate
+$ source .venv/bin/activate
 
 $ ./reflash.sh compile ''
 ```
@@ -30,7 +37,7 @@ $ ./reflash.sh compile ''
 
 ```
 # Optional
-$ source venv/bin/activate
+$ source .venv/bin/activate
 
 $ ./reflash.sh
 ```
@@ -39,7 +46,7 @@ or
 
 ```
 # Optional
-$ source venv/bin/activate
+$ source .venv/bin/activate
 
 $ esphome run file.yaml
 ```