FREE - TINKERCAD - TUTORIAL
Don't need to download any software, it is freely available online
This tutorial will help to design 3D blocks very easily , just go through my video lectures on Tinkercad on my youtube channel
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Step 1: FREE - TINKERCAD TUTORIAL
More such videos on my youtube channel - go through the playlist - https://youtube.com/playlist?list=PLxtiTGwRHk3NGmfao5H_whI1jtAEIL37A