# Rule examples for master rules

Advertising or selling online can be a real struggle, especially if you want to optimize your data for different channels. You can do that manually or create rules in every export channel. However, when you have a lot of channels that could benefit from the same changes, you can use master rule groups. This article gives examples of the types of rules you can use in the Master Rule section of our tool.

Examples of rules you can use in Master Rule groups:

### General Filter

Do some items lack information like images, price, etc.? These are issues in your feed that you certainly want to eliminate for any export. If you use a general filter, you save time sorting this out for every export.

<figure><img src="/files/23676126f246a882e370ef925be560171b89dce5" alt=""><figcaption></figcaption></figure>

### Excluding Seasonal Products

If it’s winter and your data feed contains winter coats but also beachwear, swimming suits, and other summer fashion, you likely want to advertise only products relevant for the cold season. With master rules, you can easily exclude summer-related items across your entire product feed so you don’t have to manage this per channel.

<figure><img src="/files/fbb0e9b82a64f25780a1387aea4cc148dbee614a" alt=""><figcaption></figcaption></figure>

### Exclude Blacklisted Products

Some brands or categories are not meant to be advertised, so you usually blacklist them. Even if you work in travel, you might want to exclude certain destinations. Create a master rule group for the items you want to blacklist and be done with it forever!

<figure><img src="/files/7aa910066709cad2a07cd6c4895aa5b1bf7e8095" alt=""><figcaption></figcaption></figure>

### Checking & Excluding Invalid EANs

Some products may have invalid EANs. This can cause issues in exports, so it's good to check these and either fix or exclude the affected products. Use the [invalid GTIN or EAN rule](/manage-improve-product-data/rules-bulk-edit-and-enrich/how-to-use-conditions-if-in-rules/rule-condition-invalid-gtin-or-ean.md).

<figure><img src="/files/63409356999be8527c9b5dfc14f28cc2dff73064" alt=""><figcaption></figcaption></figure>

### Modifying Text

If your feed contains HTML or textual discrepancies (for example, unwanted capitals), the [modify text action](/manage-improve-product-data/rules-bulk-edit-and-enrich/how-to-use-actions-then-in-rules/rule-action-modify-text.md) can be useful across all your products and exports.

<figure><img src="/files/bc9f5419975d66016edfaa0013b513af10013ddf" alt=""><figcaption></figcaption></figure>


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