My husband is a mechanic and works for a company, he buys tools to work, how can I deduct the expenses for these tools he buys for work?

This TurboTax FAQ tells you where you can claim Employment Expenses in TurboTax Online:

https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/self-employment-taxes/claim-employment-expenses-turbotax-online/L90YUT7O2_CA_en_CA?uid=lukag875

This TurboTax FAQ tells you where you can claim Employment Expenses in TurboTax CD/Download: https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/manage-expenses/claim-employment-expenses-turbotax-cd-download/L4hbca7lQ_CA_en_CA?uid=lukah1pe