Learn French: Il va travailler sans limites. - He is going to work without limits.

After the preposition sans (without), French usually drops indefinite articles (un, une, des) and partitive articles (du, de la). Since you would normally say des limites (limits / some limits), the des simply disappears, leaving us with just sans limites.

Could I write sans limite in the singular instead?

Yes, both sans limite (singular) and sans limites (plural) are correct and commonly used to mean 'without limits' or 'limitless'. They mean the same thing and sound exactly the same when spoken, since the final s is silent.

Why use va travailler instead of just travaillera?

Il va travailler uses the near future tense (aller + infinitive), which translates directly to 'He is going to work.' You could also use the simple future tense, Il travaillera (He will work). Both are fine, but the near future is extremely common in everyday French for actions that are planned or happening soon.

Do I pronounce the s at the end of sans?