I did Porto to Braga and also Ponte de Lima to Braga in 2018. Walking in the right direction is not too bad, but you shouldn't intend to find the way walking in the opposite direction. There are no markers towards Porto on this part of the trail. If for you want to walk towards Porto / Fatima take the classic central route which is marked or the coastal way, which is more or less self explaining and has some markers as well.
Leaving Porto is not too easy. There are arrows from the cathedral , but I am not sure if one can find the detour towards Braga without a map (That was the only helpful thing I got from the tourism office there. Friendly people, but expect not much info for this particular way.) After Praca da Republica I could rely on the arrows.
If you want to skip the inner city area, take the Metro to IPO and continue to the north. You will see the arrrows very soon.
You will not find any real albergue on the way to Braga, but there is a similar kind of accomodation in Antas (Seminario Comboiano). You may also ask the Bombeiros for a place to stay or take your chances in a few pensions/hotels usually not so nearby. The train line to Braga is close by car, but often not close enough if you are walking. Buses were rare on a Sunday, but should run on weekdays. There is probably a good connection into Maia and maybe also to the airport area of Porto. The closed place to sleep I noticed was "A Cepa" en Santo Tirso, about 150m off the way.
Hotels can be expensive in Famalicao, which is at least 1km detour from Antas. The only hostel is about 2km away.
The distances between the accomondations could be better. I would not recommend thirty something km (Antas) on your first day if you are just starting. Pilgrims coming from Fatima/Lisbon can manage that, but it's still long. The next day to Braga is again not very short.
The albergue in Braga charged 5€ per night and encourages the pilgrims to stay not only one. The kitchen is made to cook for groups, not really for individuals. Wifi is available near the reception. Plenty of bunk beds.
The next place to stay is the albergue of Goaes. An old school building, 5 or 6 normal beds, shower and a full kitchen. No wifi. The big supermarket is 1km after the village, the restaurant on your way in provides you the key and sells some food as well.
Ponte de Lima, 37km from Braga offers any kind of lodging and food.
It's a rather solitary way, with a lot of termac walking, but it felt safe to walk there. Not too much traffic and many sidewalks avoid to get hit by a car. In Braga I met pilgrims coming from Porto and Guimaraes. So don't expect to be alone in there
.
For GPS Tracks I recommend the OSM maps presented by
https://hiking.waymarkedtrails.org. If you see it here it is also in most GPS Apps for your phone. You can download the tracks without any registration and can have a look on the profile here.
