Improved documentation

docs/usage/tips_tricks.md

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+---
+title: Tips & Tricks
+layout: default
+parent: Usage
+---
+
+# Tips & Tricks
+
+Following you can find miscellaneous tips and tricks for using Part-DB.
+
+## Create datastructures directly from part edit page
+
+Instead of first creating a category, manufacturer, footprint, etc. and then creating the part, you can create the 
+datastructures directly from the part edit page: Just type the name of the datastructure you want to create into the 
+select field on the part edit page and press "Create new ...". The new datastructure will be created, when you save
+the part changes.
+
+You can create also create nested datastructures this way. For example, if you want to create a new category "AVRs", 
+as a subcategory of "MCUs", you can just type "MCUs->AVRs" into the category select field and press "Create new".
+The new category "AVRs" will be created as a subcategory of "MCUs". If the category "MCUs" does not exist, it will
+be created too.
+
+## Builtin footprint images
+Part-DB includes several builtin images for common footprints. You can use these images in your footprint datastructures,
+by creating an attachment on the datastructure and selecting it as preview image.
+Type the name of the footprint image you want to use into the URL field of the attachment and select it from the
+dropdown menu. You can find a gallery of all builtin footprint images and their names in the "Builtin footprint image gallery",
+which you can find in the "Tools" menu (you maybe need to give your user the permission to access this tool).
+
+## Parametric search
+In the "parameters" tab of the filter panel on parts list page, you can define constraints, which parameter values
+have to fullfill. This allows you to search for parts with specific parameters (or parameter ranges), for example you
+can search for all parts with a voltage rating of greater than 5 V.
+
+## View own users permissions
+If you want to see which permissions your user has, you can find a list of the permissions in the "Permissions" panel
+on the user info page.
+
+## Use LaTeX equations
+You can use LaTeX equations everywhere where markdown is supported (for example in the description or notes field of a part).
+[KaTeX](https://katex.org/) is used to render the equations.
+You can find a list of supported features in the [KaTeX documentation](https://katex.org/docs/supported.html).
+
+To input a LaTeX equation, you have to wrap it in a pair of dollar signs (`$`). Single dollar signs mark inline equations,
+double dollar signs mark displayed equations (which will be its own line and centered). For example, the following equation
+will be rendered as an inline equation:
+
+```
+$E=mc^2$
+```
+
+while this one will be rendered as a displayed equation:
+
+```
+$$E=mc^2$$
+```
+
+## Update currency exchange rates automatically
+Part-DB can update the currency exchange rates of all defined currencies programatically
+by calling the `php bin/console partdb:currencies:update-exchange-rates`.
+
+If you call this command regularly (e.g. with a cronjob), you can keep the exchange rates up-to-date.
+
+Please note that if you use a base currency, which is not the Euro, you have to configure an exchange rate API, as the
+free API used by default only supports the Euro as base currency.