Before applying GD & T for product designs, know the fundamentals first
1. Fits and Tolerances
2. Bonus tolerance
3. Feature and Feature of size
4. 14 Symbols in GD & T
P.S : i have attached the 14 symbol chart in GD & T.
kudos to google, you can find the same or much better documents in google.
Happy to help ;)
AttachmentsGD_T Color Chart.pdf, 60.8 KB