I am new to QGIS. I found the problem impossible to solve the parts of raster data that are in TIFF format should be made transparent. What do I do?
I did not understand what specific question you have, since you only described your problem. I m quite new to GIS but I think I may be able to help. Can you please form a clear question that requires a clear answer? Note* I know that this is rather a comment than an answer, but I m currently still unable to comment.
Edit: Ok; If I get you right you want to achieve to make parts of your Raster(that is in TIFF Format) transparent. Actually this is quite simple;RasterLayer->right click->Properties->global Transparency. Here you can adjust the value. If you need it for specific areas only use the clipping method. (Menue->Raster->Extraction->Clipper). Hope this helps.
The link below seems to be a similar question
It gives a step by step guide to doing so.