can i use a higher wattage charger for my laptop

Well, it often depends on the laptop in question. Yes, you generally can use a higher wattage charger for your laptop. A higher wattage charger won't force your laptop to draw more power than it's capable of, thus it shouldn't damage your laptop if everything else is compatible. However, you might not see any real benefit in doing so, depending on your laptop's design.

Not necessarily. Even though a higher wattage charger can supply more power, your laptop will only draw as much power as its built-in charger allows. And the rate at which it charges is determined by the charging circuit of the laptop, not the power supply. So, it's likely that your laptop would still charge at virtually the same speed.

That might be risky. Using a different brand's charger carries some risk if the connectors or voltage aren't the same. If the charger can't supply the exact voltage that the laptop requires, it can either undercharge or overcharge the laptop's battery, which could lead to damage. So, it's generally advisable to use the charger that came with your laptop or an approved replacement from the same manufacturer.