A lot of blocks don't show and cannot be used in the /give or /fill command like( concrete terracotta ex.)
MCPE-64374
Some blocks do not show when using the /give or /fill command example (different colours of concrete)
Resolved
Cannot Reproduce
1
Many blocks in Bedrock require a data value to be given. For example, if you want to give yourself orange concrete, the command would be:
To find out what the data values are for a block, check out the "Data values" section on that block's page on the Minecraft Wiki.