Selangor is a reasonably safe state. However, several cases of snatch thefts have been reported in urban areas, some including deaths so be careful with your belongings. Make sure to put handbags away from open car windows and where motorbike can easily snatch your handbags on roadsides and try to have at least one companion to accopany you around, even for males as criminal cases have been on increase of late.
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Malay is the national language of Malaysia, but the usage of English is widespread. Most locals are bilingual and understand other languages such as Tamil, Mandarin and Cantonese thanks to racial diversity synonymous of Malaysia.