There is no magic method for planting garden seeds. It takes time and patience if you are going to be frugal with you supplies. If you have a small garden, say 200 square feet or so you will probably will be on you hands and knees sprinkling seeds in a shallow trough you have cut in the soil. You may want to mix the smaller seeds with sand so it's easier to spread them out. Of course you can just shake them out of the packet as well. Do read the instructions on the packet. There is a lot of useful information there. It could save you some time and money. You might find a device like the one at the right useful. They cost about $2 plus shipping on Amazon.
In 2017 I invested in a planter for the garden. I can sow a row (60 feet or more) of turnips in about 1 minute with this gadget. I would probably take at least 30 minutes on my hands and knees. I planted other things with the planter as well but the turnips came out the best. Of course they were the last thing it used the planter to plant. Just like any other tool there is a learning curve. It did make planting go a lot faster than in 2016 when the garden was half the size. A planter like the Earthway goes for around $110 plus shipping at many locations. Everything is a learning experience.
There are much more expensive planters. If you are planting more than a half acre you might want to invest in a much larger planter than I have. Companies also make machines that put in seedlings as well.