Your pressure canner should come with complete instructions. Please follow them carefully. As a precaution, low acid canned foods should not be tasted or eaten unless thoroughly reheated. Canned vegetables should be brought to a rolling boil for 10 minutes. Corn, meat, seafood and poultry should be held at a rolling boil for 20 minutes.
Manufacturers make heavy-duty jars specifically for home canning.
Do not use, say, empty peanut butter jars, as commercial jars are not heavy enough to be safely used for repeated home cannings. The jars themselves can be used many times, as long as the sealing rims are perfectly smooth and there are no scratches or cracks. The other safety factor to keep in mind is cleanliness. All work surfaces should be kept clean during all stages of the canning process. The food being preserved must itself be rinsed clean.