It is always best to work under the guidance of someone who has the experience of working in a lab. That could be an instructor or a guide. This person by virtue of prior experience would know the rights and the wrongs in a lab and can guide you safely on the use of lab equipment
Usually there are approved safety goggles that are worn while working in the lab. These safety glasses protect anything from entering your eyes

Make sure you read the bottle labels carefully and only use what you are supposed to use during an experiment. You should not try out anything on your own unless you are very sure of what reagents or chemicals you need to use and their results

Do not touch anything that you are not authorized to touch especially if it is a chemical or an acid that could cause harm to you

Do not eat or drink anything in a laboratory. If you are not careful you could end up in severe trouble in case you happen to ingest anything that causes you harm

Always ensure that you wear proper fitting clothes and nothing that is too loose. You should also wear your lab coat to avoid spilling anything on your clothes

Wear proper footwear that is closed. Sandals and open toed slippers are a strict no no and should be avoided
One must also know how to use the lab equipments properly and should ask the right way of usage, in case they do not know