I like the word Blasta
Can this not mean the cake is tasty?
Not without an article in the Gaelic. Gaelic doesn't use indefinite articles, so it could be ‘cake’, or ‘a cake’ were context to permit, but not ‘the cake’.
Exactly this. In English, cèic could be a cake or cake, but the cake would be a' chèic.
'The cake is tasty.' > 'Tha a' chèic blasta.'
Is cèic a feminine noun and therefore takes a 'h'?
Cèic is indeed feminine. So 'a tasty cake' would be cèic bhlasta, if that's what you mean.
how do I put in accents?
Hold on the particular letter on your keyboard. I'm not sure about what to do for laptops though.
as asked before what is the difference with a accent above a word and one that has not
Mainly pronunciation. In this sentence the accent over the e makes ther sound longer:
"Cèic" sounds lile caaake whereas "ceic" would be shorter like cake.
It can also change the meaning of a word:
"bàta" - boat
"bata" - walking stick