Hello,
There are a lot of Online Sanskrit course that you can choose from.
1. Udemy
2. Openpathshala.com (//Openpathshala.com)
3. Learnsanskritonline.com (//Learnsanskritonline.com)
4. Classcentral.com (//Classcentral.com)
5. sanskrit.today
6. learnsanskrit.org (//learnsanskrit.org)
The best resources for learning any language is speaking and listening to the language as much as possible.
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