Rrerku

I want just migrate customer and orders from Magento 1 to Magento 2 how can I ignore other data like cms page, block, products, etc.
where do I need to change in config.xml?
Magento 1 Version : 1.9.3.1

Magento 2 Version : 2.3.1

Install Data Migration Tool

1) Check your Magento 2 version :- sudo php bin/magento --version

2) Install Data Migration Tool from repo.magento.com :-

composer config repositories.magento composer https://repo.magento.com 
composer require magento/data-migration-tool:<magento_version>

3) Configure Magento 2 Data Migration Tool :-

 1 The above file will contain configuration and scripts for migrating from Magento 1 Open Source platform to Magento 2 Open Source platform.
 <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/opensource-to-opensource

 2 The above file will contain configuration and scripts for migrating from Magento 1 Open Source platform to Magento 2 Commerce.
 <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/opensource-to-commerce

 3 The above file will contain configuration and scripts for migrating from Magento 1 Commerce to Magento 2 Commerce.
 <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/commerce-to-commerce

4) Configuring the migration :-

 1 Change to the following directory :-
 <your Magento 2 install dir>/vendor/magento/data-migration-tool/etc/<migration edition>/<ce or version>

 2 Rename config.xml.dist to config.xml 
 cp config.xml.dist config.xml

 3 Open config.xml in a text editor.

 4 Specify the following at minimum:

 <database host="localhost" name="Magento1-DB-name" user="DB-username" password="DB-password"/>

 </source>

 <destination>

 <database host="localhost" name="Magento2-DB-name" user="DB-username" password="DB-password"/>

 </destination>

 <options>

 <crypt_key>Magento1-Encrypted-Key</crypt_key>

 </options>

5) Migrate settings :-

 php bin/magento migrate:settings --reset vendor/magento/data-migration-tool/etc/<edition-to-edition>/<version>/config.xml

6) Migrate Data :-

 php bin/magento migrate:data --auto vendor/magento/data-migration-tool/etc/<edition-to-edition>/<version>/config.xml

7) Migrate Delta :-

 php bin/magento migrate:delta --auto vendor/magento/data-migration-tool/etc/<edition-to-edition>/<version>/config.xml

Config.xml

<steps mode="data">
 <step title="Customer Attributes Step">
 <integrity>MigrationStepCustomerIntegrity</integrity>
 <data>MigrationStepCustomerData</data>
 <volume>MigrationStepCustomerVolume</volume>
 </step>

 <step title="Map Step">
 <integrity>MigrationStepMapIntegrity</integrity>
 <data>MigrationStepMapData</data>
 <volume>MigrationStepMapVolume</volume>
 </step>
 <step title="OrderGrids Step">
 <integrity>MigrationStepOrderGridsIntegrity</integrity>
 <data>MigrationStepOrderGridsData</data>
 <volume>MigrationStepOrderGridsVolume</volume>
 </step>
 <step title="SalesIncrement Step">
 <integrity>MigrationStepSalesIncrementIntegrity</integrity>
 <data>MigrationStepSalesIncrementData</data>
 <volume>MigrationStepSalesIncrementVolume</volume>
 </step>
</steps>

As Per Your Requirement Config File Like This

Please do the changes in the data-migration-tool/etc/opensource-to-opensource/1.9.3.1/config.xml. You can rename the config.xml.dist to config.xml. You can comment out all other steps except these. Please follow this for detailed instruction https://devdocs.magento.com/guides/v2.3/migration/migration-tool-configure.html

<steps mode="data">
 <step title="Customer Attributes Step">
 <integrity>MigrationStepCustomerIntegrity</integrity>
 <data>MigrationStepCustomerData</data>
 <volume>MigrationStepCustomerVolume</volume>
 </step>
 <step title="Map Step">
 <integrity>MigrationStepMapIntegrity</integrity>
 <data>MigrationStepMapData</data>
 <volume>MigrationStepMapVolume</volume>
 </step>
 <step title="OrderGrids Step">
 <integrity>MigrationStepOrderGridsIntegrity</integrity>
 <data>MigrationStepOrderGridsData</data>
 <volume>MigrationStepOrderGridsVolume</volume>
 </step>
 <step title="SalesIncrement Step">
 <integrity>MigrationStepSalesIncrementIntegrity</integrity>
 <data>MigrationStepSalesIncrementData</data>
 <volume>MigrationStepSalesIncrementVolume</volume>
 </step>
</steps>

If you want delta migration to be performed(migrating recent data after last migration) please configure this

<steps mode="delta">
 <step title="Customer Attributes Step">
 <delta>MigrationStepCustomerDelta</delta>
 <volume>MigrationStepCustomerVolume</volume>
 </step>
 <step title="Map Step">
 <delta>MigrationStepMapDelta</delta>
 <volume>MigrationStepMapVolume</volume>
 </step>
 <step title="OrderGrids Step">
 <delta>MigrationStepOrderGridsDelta</delta>
 <volume>MigrationStepOrderGridsVolume</volume>
 </step>
 <step title="SalesIncrement Step">
 <delta>MigrationStepSalesIncrementDelta</delta>
 <volume>MigrationStepSalesIncrementVolume</volume>
 </step>
</steps>